CC 2018-11-27_12a Certification of Five Year Radar Speed Survey
MEMORANDUM
TO: CITY COUNCIL
FROM: TERESA McCLISH, COMMUNITY DEVELOPMENT DIRECTOR
BEAU PRYOR, POLICE CHIEF
BILL ROBESON, PUBLIC WORKS DIRECTOR
BY: ROBIN DICKERSON, CITY ENGINEER
SUBJECT: CONSIDERATION OF CERTIFICATION OF THE FIVE-YEAR RADAR
SPEED SURVEY FOR SELECTED CITY STREETS
DATE: NOVEMBER 27, 2018
SUMMARY OF ACTION:
The California Vehicle Code requires an engineering and traffic speed survey to enable
the radar enforcement of any speed limit set by a local jurisdiction. Certification of this
survey would allow the City Police Department to enforce these speed limits.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
The project will require the Public Works Department staff to replace or install speed limit
signs and/or poles and associated pavement markings. The cost is estimated to be
$5,700. The money will be allocated as a mid-year budget adjustment from the Public
Works budget.
RECOMMENDATION:
It is recommended the City Council adopt a Resolution Certifying the five-year radar
speed survey for selected City Streets.
BACKGROUND:
The California Vehicle Code requires a current engineering and traffic speed survey to
enable the radar enforcement of any speed limit set by a local jurisdiction. Due to the
constraints of the pursuit method of enforcement on City streets, this requirement
effectively dictates all enforcement of locally adopted speed limits. Because the speed
surveys for selected streets are no longer current, traffic speed enforcement within the
City is currently restricted to those limits expressly established by the Vehicle Code, such
as the 25 mph school zone limit when children are present. Absent such express limits,
the 55 mph maximum limit prevails.
Item 12.a. - Page 1
CITY COUNCIL
CONSIDERATION OF CERTIFICATION OF THE FIVE-YEAR RADAR SPEED SURVEY
FOR SELECTED CITY STREETS
NOVEMBER 27, 2018
PAGE 2
The basic presumption of the engineering and traffic speed survey requirement is that the
majority of the public drives at a reasonable speed and that limits should be established
accordingly. The 85th percentile is generally accepted as the statistical break between
reasonable and unreasonable drivers. Speed limits in California are governed by the
California Vehicle Code, Sections 22348 through 22413. California Manual on Uniform
Traffic Control Devices, November 2014 (Traffic Manual), defines the methodology for
performing vehicle speed surveys. The speeds of the vehicles are measured by
conducting speed sampling, using a radar speed gun. The radar gun operator is stationed
in an unidentified vehicle and takes speed measurements with a certified radar gun,
sampling a minimum of 100 vehicles in each direction. The data is then quantified and
the recommended speed limit is set at the five-mile-per-hour increment reflecting the
observed 85th percentile (or critical) speed, unless the City Engineer determines that
there are mitigating factors not readily observable to the driver, such as accident history
and roadside conditions. The accident history is also considered, and under appropriate
circumstances the City Engineer is permitted to lower the critical speed by five-miles-per-
hour.
Establishing a speed limit at the recommended level where the existing posted speed
limit is lower should not be viewed as raising the speed limit. It is a legal establishment of
the speed that reasonable drivers are already driving, and it allows enforcement of
citations against those who are exhibiting unreasonable behavior.
ANALYSIS OF ISSUES:
Staff representatives from the Police, Public Works, and Community Development
Departments in conjunction with the sub-consultant Pavement Engineering Inc. jointly
reviewed the status of City streets requiring radar speed surveys to determine their
validity for enforcement. Staff determined that there were 70 street segments where the
surveys should be updated. Police Volunteers performed the radar speed surveys on 45
street sections from June 2018 to September 2018. The remaining 28 speed surveys
were previously performed in 2016 by City Staff. Three streets were performed in both
2016 and 2018 showing that the speeds on the streets remained consistent in the two-
year time period.
The results of the survey are as follows:
Street Street Segment Existing
(MPH)
Recommended
(MPH)
Ash St City Limits to S Elm St 35 30
Branch Mill Rd E Cherry Ave to Newsom Springs Rd 40 40
Brisco Rd Linda Dr to El Camino Real 35 35
Brisco Rd E Grand Ave to Linda Dr 30 30
Camino Mercado W Branch St to Via Las Aguilas 30 30
Camino Mercado Via Las Aguilas to Rancho Pkwy 30 35
Corbett Canyon Printz Rd to City Limits 45 45
Item 12.a. - Page 2
CITY COUNCIL
CONSIDERATION OF CERTIFICATION OF THE FIVE-YEAR RADAR SPEED SURVEY
FOR SELECTED CITY STREETS
NOVEMBER 27, 2018
PAGE 3
Street Street Segment Existing
(MPH)
Recommended
(MPH)
Corbett Canyon Paseo St to Printz Rd 35 40
Corbett Canyon Huasna Rd to Wildwood Dr 40 35
E Branch St Garden St to Huasna Rd 30 30
E Branch St Garden St to Paulding Circle 30 30
E Branch St Bridge St to Mason St 25 25
E Cherry Ave Pacific Coast Railway to Branch Mill Rd 35 35
E Cherry Ave Traffic Way to Pacific Coast Railway 25 30
E Grand Ave Oak St to 101 Off-ramp 35 35
E Grand Ave Alpine St to Oak St 35 35
E Grand Ave Brisco Rd to Alder St 35 35
E Grand Ave Courtland St to Elm St 35 35
El Camino Real Oak Park Blvd to Robles Rd 45 45
El Camino Real Robles Rd to Stonecrest Dr 40 40
El Camino Real Stonecrest Dr to Brisco Rd 40 40
El Camino Real N Halcyon Rd to Bennett Ave 35 35
El Camino Real Bennett Ave to Cornwall Ave 35 35
Fair Oaks Ave Orchard Ave to Traffic Way 35 30
Fair Oaks Ave Valley Rd to California St 35 35
Fair Oaks Ave Valley Rd to S Halcyon Rd 40 40
Farroll Ave S Elm to Victorian Ct 30 30
Farroll Ave Bakeman Ln to S Elm St 35 30
Grace Lane N Rodeo Dr to S Rodeo Dr 35 35
Huasna Rd Corbett Canyon to Stagecoach Rd 40 40
Huasna Rd Stagecoach Rd to City Limits 45 45
James Way Oak Park Blvd to Equestrian Way 40 40
James Way Equestrian Way to Rancho Pkwy 40 40
James Way Rancho Pkwy to Hidden Oak Rd 40 35
James Way Hidden Oak Rd to Tally Ho Rd 35 35
Le Point St N Mason St to Via La Barranca -- 30
N Courtland St E Grand Ave to Brighton St 25 25
N Elm St E Grand Ave to end of Cul de sac 25 25
N Halcyon Rd E Grand Ave to Bennett Ave 35 35
N Mason St Le Point St to E Branch St -- 25
Oak Park Blvd Farroll Ave to Naples St 35 35
Oak Park Blvd W Branch St to James Way 40 40
Oak Park Blvd James Way to Meadowlark Dr 40 40
Rancho Pkwy W Branch St to Camino Mercado 35 35
Rancho Pkwy Camino Mercado to Palos Secos 40 40
Rancho Pkwy Palos Secos to Refugio Pl 40 40
S Courtland St E Grand Ave to Blueberry Ave -- 30
S Courtland St Blueberry Ave to Ash St 25 25
S Elm St E Grand Ave to Maple St 35 35
S Elm St Ash St to Fair Oaks Ave 25 25
S Elm St Fair Oaks Ave to Farroll Ave 30 30
Item 12.a. - Page 3
CITY COUNCIL
CONSIDERATION OF CERTIFICATION OF THE FIVE-YEAR RADAR SPEED SURVEY
FOR SELECTED CITY STREETS
NOVEMBER 27, 2018
PAGE 4
Street Street Segment Existing
(MPH)
Recommended
(MPH)
S Elm St The Pike to City Limits 35 35
S Halcyon St Park Way to Dodson Way 35 35
S Halcyon St Dodson Way to Fair Oaks Ave 35 35
S Halcyon St Fair Oaks Ave to The Pike 40 40
Tally Ho Rd Printz Rd to James Way 35 35
Tally Ho Rd James Way to Via La Barranca 30 30
The Pike Del Sol St to S Elm St 35 35
The Pike S Elm St to Gaynfair Tr 40 35
The Pike Gaynfair Tr to S Halcyon Rd 40 40
Traffic Way W Branch St to Fair Oaks Ave 35 35
Traffic Way Fair Oaks Ave to 101 on ramp 35 35
Valley Rd Fair Oaks Ave to Sunrise Terrace -- 40
Valley Rd Sunrise Terrace to Tiger Tail Dr 40 40
W Branch St 101 Off ramp to Bridge St 25 25
W Branch St E Grand Ave to Vernon St -- 30
W Branch St Vernon St to Old Ranch Rd 40 40
W Branch St Old Ranch Rd to Rodeo Dr 40 40
W Branch St Rancho Pkwy to Camino Mercado 40 40
W Branch St Camino Mercado to N Oak Park Blvd 40 40
The results of the survey are as follows:
The survey verified the current posted speed limit for the majority of the streets.
Six streets are recommended for a 5 MPH reduction in the posted speed limit:
o Ash St from the City Limits to S Elm St
o Corbett Canyon Rd from Huasna Rd to Wildwood Dr.
o Fair Oaks Ave from Orchard Ave to Traffic Way
o Farroll Ave from Bakeman Lane to S Elm St
o James Way from Rancho Parkway to Hidden Oaks Road
o The Pike from S Elm St to Gaynfair Terrace
Three Streets are recommended for a 5 MPH increase in the posted speed limit:
o Camino Mercado from Via Las Aguilas to Rancho Parkway
o Corbett Canyon from Paseo St to Printz Rd
o E Cherry from Traffic Way to Pacific Coast Railway
4 Street Segments are currently not posted. Speed Limits are recommended as
shown above
o Le Point from North Mason Street to Via La Barranca
o N Mason Street from E Branch to Le Point
o S Courtland from E Grand Ave to Blueberry Ave
o Valley Road from Fair Oaks to Sunrise Terrace
o W Branch Street from East Grand Avenue to Vernon Street
Eleven streets are recommended for speed limits to remain although the speed
survey indicates speeds about 5 MPH above posted speed limits. California
Item 12.a. - Page 4
CITY COUNCIL
CONSIDERATION OF CERTIFICATION OF THE FIVE-YEAR RADAR SPEED SURVEY
FOR SELECTED CITY STREETS
NOVEMBER 27, 2018
PAGE 5
Vehicle Code Section 627 allows engineering judgement to make downward 5
MPH adjustments under appropriate circumstances. The Engineering and Traffic
Survey prepared by Pavement Engineering Inc justifies the 5 MPH reduction that
allow posted speeds to remain the same for the following streets:
o Corbett Canyon from Printz Road to City Limits
o E Branch Street from Garden Street to Paulding Circle
o E Cherry Avenue from Traffic Way to Pacific Coast Railway
o E Grand Avenue from Brisco Road to Alder Street
o Farroll Avenue from S Elm Street to Victorian Court
o James Way from Equestrian Way to Rancho Parkway
o James Way from Hidden Oak Road to Tally Ho Road
o N Courtland Street from E Grand Avenue to Brighton Street
o S Elm Street from Ash Street to Fair Oaks Avenue
o Traffic Way from Fair Oaks Avenue to 101 on Ramp
o Valley Road from Sunrise Terrace to Tiger Tail Drive
ALTERNATIVES:
The following alternatives are provided for the Council’s consideration:
1. Adopt a Resolution certifying the 2018 Radar Speed Survey;
2. Modify and adopt the Resolution with elimination of specific streets that will remain
unenforceable;
3. Do not certify the survey and perform a new survey at a future date; or
4. Provide direction to staff.
ADVANTAGES:
Adoption of the speed survey will provide a legal basis for the Police Department to
enforce speed limits on the identified City roadway segments. Establishing appropriate
speed limits improves safety. In addition, the majority of changes involve a lower speed
limit, which may help address citizen concerns.
DISADVANTAGES:
Modifications to the speed limits can often result in citizen concerns, however staff
believes all proposed changes are justified based upon the data obtained.
ENVIRONMENTAL REVIEW:
No environmental review is required for this item.
PUBLIC NOTIFICATION AND COMMENTS:
The Agenda was posted at City Hall and on the City’s website in accordance with
Government Code Section 54954.2.
Attachment:
1. November 2018 Engineering and Traffic Survey prepared by Pavement Engineering
Inc.
Item 12.a. - Page 5
RESOLUTION NO.
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF
ARROYO GRANDE CERTIFYING THE FIVE-YEAR RADAR
SPEED SURVEY FOR SELECTED CITY STREETS
WHEREAS, the City Council of Arroyo Grande has conducted Engineering and Traffic
Speed Surveys (collectively referred to herein as the “surveys”) on various City Streets in
accordance with the requirements of the California Vehicle Code; and
WHEREAS, the City Engineer, Public Works Director and the Community Development
Director have analyzed the surveys, made appropriate adjustments, and made
recommendations for the establishment of speed limits on said streets in accordance with
the requirements of the California Vehicle Code; and
WHEREAS, radar enforcement of any speed limit other than those expressly established
by State Law requires that such speed limits be based upon an engineering and traffic
speed survey as has been conducted; and
WHEREAS, the Police Chief has carefully reviewed and fully supports the
recommendations of the City engineer, Public Works Director and the Community
Development Director.
NOW, THEREFORE BE IT RESOLVED that the City Council of the City of Arroyo Grande
does hereby certify the surveys and establishes speed limits on various City Streets as
provided below:
Street Street Segment Recommended
(MPH)
Ash St City Limits to S Elm 30
Branch Mill Rd E Cherry to Newsom 40
Brisco Rd Linda Dr to El Camino Real 35
Brisco Rd E Grand to Linda Dr 30
Camino Mercado W Branch to Via Las Aguilas 30
Camino Mercado Via Las Aguilas to Rancho Pwy 35
Corbett Canyon Printz Rd to City Limits 45
Corbett Canyon Paseo St to Printz Rd 40
Corbett Canyon Huasna Rd to Wildwood Dr 35
E Branch St Garden St to Huasna Rd 30
E Branch St Garden St to Paulding Circle 30
E Branch St Bridge St to Mason St 25
E Cherry Ave Pacific Coast Railway to Branch Mill Rd 35
E Cherry Ave Traffic Way to Pacific Coast Railway 30
E Grand Ave Oak St to 101 off ramp 35
E Grand Ave Alpine St to Oak St 35
E Grand Ave Brisco Rd to Alder St 35
E Grand Ave Courtland St to Elm St 35
El Camino Real Oak Park Blvd to Robles Rd 45
Item 12.a. - Page 6
RESOLUTION NO.
PAGE 2
Street Street Segment Recommended
(MPH)
El Camino Real Robles Rd to Stonecrest Dr 40
El Camino Real Stonecrest Dr to Brisco Rd 40
El Camino Real N Halcyon Rd to Bennett Ave 35
El Camino Real Bennett Ave to Cornwall Ave 35
Fair Oaks Ave Orchard Ave to Traffic Way 30
Fair Oaks Ave Valley Rd to California St 35
Fair Oaks Ave Valley Rd to S Halcyon Rd 40
Farroll Ave S Elm to Victorian Ct 30
Farroll Ave Bakeman Ln to S Elm St 30
Grace Lane N Rodeo Dr to S Rodeo Dr 35
Huasna Rd Corbett Canyon to Stagecoach 40
Huasna Rd Stagecoach to City Limits 45
James Way Oak Park to Equestrian 40
James Way Equestrian to Rancho Pkwy 40
James Way Rancho Pkwy to Hidden Oak Rd 35
James Way Hidden Oak Rd to Tally Ho 35
Le Point St N Mason to Via La Barranca 30
N Courtland St E Grand Ave to Brighton St 25
N Elm St E Grand to end of Cul de sac 25
N Halcyon Rd E Grand Ave to Bennett Ave 35
N Mason St Le Point St to E Branch St 25
Oak Park Blvd Farroll Ave to Naples St 35
Oak Park Blvd W Branch St to James Way 40
Oak Park Blvd James Way to Meadowlark Dr 40
Rancho Pkwy W Branch St to Camino Mercado 35
Rancho Pkwy Camino Mercado to Palos Secos 40
Rancho Pkwy Palos Secos to Refugio Pl 40
S Courtland St E Grand Ave to Blueberry Ave 30
S Courtland St Blueberry Ave to Ash St 25
S Elm St E Grand Ave to Maple St 35
S Elm St Ash St to Fair Oaks Ave 25
S Elm St Fair Oaks Ave to Farroll Ave 30
S Elm St The Pike to City Limits 35
S Halcyon St Fair Oaks to The Pike 35
S Halcyon St Dodson Way to Fair Oaks 35
S Halcyon St Fair Oaks to The Pike 40
Tally Ho Printz Rd to James Way 35
Tally Ho James Way to Via La Barranca 30
The Pike Del Sol St to S Elm St 35
The Pike S Elm to Gaynfair Tr 35
The Pike Gaynfair Tr to S Halcyon 40
Traffic Way W Branch St to Fair Oaks 35
Traffic Way Fair Oaks to 101 on ramp 35
Valley Rd Fair Oaks to Sunrise Terrace 40
Valley Rd Sunrise Terrace to Tiger Tail Dr 40
W Branch St 101 Off ramp to Bridge St 25
W Branch St E Grand Ave to Vernon St 30
Item 12.a. - Page 7
RESOLUTION NO.
PAGE 3
Street Street Segment Recommended
(MPH)
W Branch St Vernon St to Old Ranch Rd 40
W Branch St Old Ranch Rd to Rodeo Dr 40
W Branch St Rancho Pkwy to Camino Mercado 40
W Branch St Camino Mercado to N Oak Park Blvd 40
BE IT FURTHER RESOLVED that the Engineering and Traffic Speed Survey dated
November 2018, prepared by Pavement Engineering, Inc. in conjunction with the City, is
hereby received and accepted.
On motion of Council Member , seconded by Council
Member , and on the following roll call vote, to wit:
AYES:
NOES:
ABSENT:
the foregoing Resolution was passed and adopted this 27th day of November, 2018.
Item 12.a. - Page 8
RESOLUTION NO.
PAGE 4
JIM HILL, MAYOR
ATTEST:
KELLY WETMORE, CITY CLERK
APPROVED AS TO CONTENT:
JAMES A. BERGMAN, CITY MANAGER
APPROVED AS TO FORM:
HEATHER K. WHITHAM, CITY ATTORNEY
Item 12.a. - Page 9
2018 CITYWIDE
ENGINEERING AND TRAFFIC SURVEY (E&TS)
FOR THE
CITY OF ARROYO GRANDE
ENGINEERING DIVISION
COMMUNITY DEVELOPMENT DEPARTMENT
300 EAST BRANCH STREET
ARROYO GRANDE, CA 93420
FINAL DRAFT
NOVEMBER 2018
PREPARED BY
ATTACHMENT 1
Item 12.a. - Page 10
CITY OF
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Pavemont Engimiering Inc.
Table of Contents
INTRODUCTION ....................................................................................................................... 1
ELEMENTS OF THE ENGINEERING AND TRAFFIC SURVEY .................................... 2
Speed Sampling .................................................................................................................... 2
Collision History .................................................................................................................. 4
Conditions Not Readily Apparent To Motorists ............................................................. 4
SURVEY CONDITIONS ........................................................................................................... 5
SURVEY LOCATIONS ............................................................................................................ 5
DATA COLLECTION ............................................................................................................. 5
Speed Data ............................................................................................................................ 5
Collision Data ....................................................................................................................... 5
Field Review Data ................................................................................................................ 6
ANALYSIS ................................................................................................................................... 7
CRITERIA .................................................................................................................................. 7
RESULTS AND RECOMMENDATIONS ............................................................................. 7
SEGMENTS WITH SPECIAL CONDITIONS .................................................................... 12
LEGISLATIVE REFERENCES ................................................................................................ 15
APPLICABLE SECTIONS OF CALIFORNIA VEHICLE CODE ..................................... 15
Basic Speed Law ................................................................................................................. 16
Speed Law Violations ........................................................................................................ 16
Prima Facie Speed Limits .................................................................................................. 16
Increase of Local Speed Limits to 65 Miles Per Hour ................................................... 18
Downward Speed Zoning................................................................................................. 18
Boundary Line Streets ....................................................................................................... 18
Speed Trap Prohibition ..................................................................................................... 19
Speed Trap .......................................................................................................................... 19
Speed Trap Evidence ......................................................................................................... 22
Item 12.a. - Page 11
Item 12.a. - Page 12
CERTIFICATION
I, Sam Tsz Kin Ho, do hereby certify that this Engineering and Traffic Survey for the
City of Arroyo Grande, California, was prepared under my direct supervision and is
complete and accurate. The registered Civil Engineer attests to the technical
information,contained herein and the engineering data upon which recommendations,
conclusions and decisions are based. I also certify that I am duly registered as a
Professional Civil Engineer in the State of California.
Nov 2. l -Z.o t8 I
Sam Tsz Kin Ho Date
Professional Registered Civil Engineer License Number: C79939
Expires September 30, 2020
Engineering and Traffic Survey
for the City of Arroyo Grande liJ
Engineering and Traffic Survey
for the City of Arroyo Grande 1
INTRODUCTION
This Engineering and Traffic Survey is intended to be the basis for the establishment,
revision, and enforcement of speed limits for selected streets within the City of Arroyo
Grande. This Engineering and Traffic Survey presents recommended speed limits for
70 street segments in the City of Arroyo Grande. Engineering and Traffic Surveys are
required by the State of California to establish intermediate speed limits on local streets
and to enforce those limits using radar or other speed measuring devices. These
surveys must be updated every 5 or 7 years to ensure the speeds reflect current
conditions as dictated by the California Vehicle Code (CVC). The CVC also requires
that the surveys be conducted based on the methodology required by The California
Manual on Uniform Traffic Control Devices (CA MUTCD) dated November 2014.
The survey was requested by the City for the proper posting of speed limits and to
enable the Police Department to utilize radar or other electronic speed measuring
devices for speed enforcement. CVC Sections 40801 and 40802 require Engineering and
Traffic Surveys that verify the prima facie speed limit before enforcement by such a
device is legal. The law further specifies that these surveys be conducted every 5 years.
The surveys can be extended to 7 years provided the City's police officer(s) have
completed a 24-hour radar operator course (CVC Section 40802(c)(2)(B)(i)(I)).
Additionally, some surveys may be extended to 10 years if a traffic engineer certifies
that no changes in roadway or traffic conditions have occurred (CVC Section 40802
(c)(2)(B)(i)(II)). These provisions assure that posted speed limits are kept reasonably
current.
The Engineering and Traffic Surveys for the City were conducted in accordance with
procedures outlined in the California Manual on Uniform Traffic Control Devices
(California MUTCD) dated November 2014 and as required by Section 627 of the
California Vehicle Code. The Code further describes three elements of an engineering
and traffic survey:
1. Measurement of prevailing speed;
2. Accident history; and
3. Roadway characteristics not readily apparent to the motorist.
Posted speed limits are established primarily to protect the general public from the
reckless and unpredictable behavior of dangerous drivers. They provide law
enforcement with a clearly understood method to identify and apprehend violators of
the basic speed law (CVC Section 22350). This law states that "No person shall drive a
Item 12.a. - Page 13
Engineering and Traffic Survey
for the City of Arroyo Grande 2
vehicle on a highway at a speed greater than is reasonable or prudent having due
regard for weather, visibility, the traffic on, and the surface and width of the highway,
and in no event at a speed which endangers the safety of persons or property." The
posted speed limit gives motorists a clear warning of the maximum speed that is
reasonable and prudent under typical driving conditions.
The basic fundamentals for establishing speed limits recognize that the majority of
drivers behave in a safe and reasonable manner, and therefore, the normally careful
and competent actions of a reasonable driver should be considered legal. Speed limits
established on these fundamentals conform to the consensus that those who drive the
highway determine what speed is reasonable and safe, not on the judgment of one or
a few individuals. A radar speed study is usually used to record the prevailing speed
of reasonable drivers.
Speed limits are also established to advise drivers of conditions which may not be
readily apparent to a reasonable driver. For this reason, accident history, roadway
conditions, traffic characteristics, and land use must also be analyzed before
determining speed limits. Speed limit changes are usually made in coordination with
physical changes in roadway conditions or roadside developments. Unusually short
zones of less than one-half mile in length should be avoided to reduce driver
confusion.
Additionally, it is generally accepted that speed limits cannot be successfully enforced
without voluntary compliance by a majority of drivers. Consequently, only the driver
whose behavior is clearly out of line with the normal flow of traffic is usually targeted
for enforcement.
ELEMENTS OF THE ENGINEERING AND TRAFFIC SURVEY
The California Manual on Uniform Traffic Control Devices (California MUTCD) dated
November 2014 specifies the methodology to be used for completing Engineering and
Traffic Surveys. This methodology includes an evaluation of current vehicle speeds,
accident history and conditions not readily apparent to motorists. The basic elements
of the Engineering and Traffic Survey are discussed in more detail as follows:
Speed Sampling
Existing vehicle speeds are surveyed by a certified radar operator with a calibrated
radar unit in an unmarked vehicle. Speed samples are taken for each segment
Item 12.a. - Page 14
Engineering and Traffic Survey
for the City of Arroyo Grande 3
representing a statistically significant sample of current traffic. This data is then
evaluated to identify the distribution of speeds. A key element in the evaluation is the
identification of the 85th percentile speed. The 85th percentile speed is the speed at or
below which 85 percent of the traffic travels. This threshold represents what is
historically found to be a safe and reasonable speed for most drivers based on common
roadway conditions. Therefore, a speed limit is established at the nearest 5-mile per
hour (mph) increment to the 85th percentile speed, except as shown in the two options
below.
Options:
1. The posted speed may be reduced by 5 mph from the nearest 5 mph increment
of the 85th percentile speed, in compliance with CVC Section 627 and 22358.5.
2. For cases in which the nearest 5 mph increment of the 85th percentile speed
would require a rounding up, then the speed limit may be rounded down to the
nearest 5 mph increment below the 85th percentile speed, if no further reduction
is used. Refer to CVC Section 21400(f).
If the speed limit to be posted has had the 5 mph reduction applied, then an E&TS shall
document in writing the conditions and justification for the lower speed limit. The
reasons for the lower speed limit shall be in compliance with CVC Section 627 and
22358.5
The following examples are provided to explain the application of these speed limit
criteria:
A. Using Option 1 above and first step is to round down: If the 85th percentile
speed in a speed survey for a location was 37 mph, then the speed limit would
be established at 35 mph since it is the closest 5 mph increment to the 37 mph
speed. As indicated by the option, this 35 mph established speed limit could be
reduced by 5 mph to 30 mph if conditions and justification for using this lower
speed limit are documented in the E&TS.
B. Using Option 1 above and first step is to round up: If the 85th percentile speed
in a speed survey for a location was 33 mph, then the speed limit would be
established at 35 mph since it is the closest 5 mph increment to the 33 mph
speed. As indicated by the option, this 35 mph speed limit could be reduced by
5 mph to 30 mph if the conditions and justification for using this lower speed
limit are documented in the E&TS.
Item 12.a. - Page 15
Engineering and Traffic Survey
for the City of Arroyo Grande 4
C. Using Option 2 above and first step is to round up: If the 85th percentile speed
in a speed survey for a location was 33 mph, instead of rounding up to 35 mph,
the speed limit can be established at 30 mph, but no further reduction can be
applied.
Collision History
Reported collisions are reviewed for each street segment to determine if there is a
higher than average rate of collisions. A segment that has an above-average collision
rate typically suggests conditions that are not readily apparent to motorists.
A summary of the collision rates for the 70 surveyed street segments is provided in
Appendix B [ON FILE AT THE CITY].
Conditions Not Readily Apparent To Motorists
Each street segment is field inspected to identify roadway conditions that may not be
readily apparent to motorists. A determination is made whether any conditions are
significant and warrant the recommendation of the speed limit 5 mph or more below
the basic speed limit. It is important to note that The California Manual on Uniform
Traffic Control Devices (California MUTCD) dated November 2014 recommends
exercising great care when establishing speed limits 5 mph or more below the basic
speed limit.
Item 12.a. - Page 16
Engineering and Traffic Survey
for the City of Arroyo Grande 5
SURVEY CONDITIONS
SURVEY LOCATIONS
The procedures below describe the criteria and methods used to survey selected streets
within the City of Arroyo Grande. The specific location of the radar speed survey for
each street segment was selected after considering the following:
1. Minimum stop sign and traffic signal influence.
2. Minimum visibility restrictions.
3. Non-congested traffic flow away from intersections and driveways.
4. Minimum influence from curves or other roadway conditions that would affect
the normal operation of a vehicle.
DATA COLLECTION
Data of existing conditions was obtained including prevailing speed of vehicles, traffic
collisions, visibility restrictions, and roadway conditions within the community. Speed
data and field reviews were conducted at 70 locations during the years of 2016 and
2018. Three locations were used as samples to verify that driver behavior has not
changed over the time period.
Speed Data
Radar speed measurements were conducted at 70 locations during the months of
November-May of 2015-2016 and July-September 2018. All surveys were conducted in
good weather conditions, during off-peak hours on weekdays. The radar unit was
operated from an unmarked vehicle to minimize any influence on driver behavior.
Typically, a minimum sample size of 100 vehicles or the total samples during a
maximum period of 2 hours were obtained for each segment. Traffic speeds in
both/each directions were recorded for individual segments.
Collision Data
Collision data was obtained from the City's SWITRS electronic collision database. For
this study, collision data was used from the latest 4 years of reported accidents from
January 1, 2014 to December 31, 2017. The collision rates for the 70 segments are
expressed in accidents per million vehicle miles (A/MVM). To calculate these rates, 24-
Item 12.a. - Page 17
Engineering and Traffic Survey
for the City of Arroyo Grande 6
hour traffic volumes were collected for each street segment. This information was then
entered into the following formula to determine the collision rate:
𝑅𝑅=𝐴𝐴 𝑥𝑥 1,000,000 𝑥𝑥 𝐴𝐴 𝑥𝑥 1,000,000𝑡𝑡 𝑥𝑥 365 𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑦𝑦𝑑𝑑𝑦𝑦 𝑥𝑥 𝑙𝑙 𝑥𝑥 𝑣𝑣
A = Number of midblock collisions over time period
R = Collision Rate (accidents/million vehicle miles)
t = Time Period Covered (in years)
I = Length of Segment (miles)
v = Traffic Volume (average daily traffic)
The segment collision rate was then compared to the average statewide collision rate.
The average statewide collision rates were obtained from 2015 Collision Data on
California State Highways published by Caltrans.
Field Review Data
A field review was conducted for each of the selected street segments in the City with
consideration for the following factors:
1. Street width and alignment (design speed);
2. Pedestrian activity and traffic flow characteristics;
3. Number of lanes and other channelization and striping patterns;
4. Frequency of intersections, driveways, and on-street parking;
5. Location of stop signs and other regulatory traffic control devices;
6. Visibility obstructions;
7. Land use and proximity to schools;
8. Pedestrian and bicycle usage;
9. Uniformity with existing speed zones and those in adjacent jurisdictions; and
10. Any other unusual condition not readily apparent to the driver.
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ANALYSIS
CRITERIA
Survey data was compiled and analyzed to determine the recommended speed limit
in accordance with several criteria contained in The California Manual on Uniform
Traffic Control Devices (California MUTCD) dated November 2014. Some of the
criteria used are:
A. The critical speed or 85th percentile speed is that speed at or below which 85
percent of the traffic is moving. This speed is the baseline value in determining
what the majority of drivers believe is safe and reasonable. Speed limits set
higher than the critical speed are not considered reasonable and safe. Speed
limits set lower than the critical speed make a large number of reasonable
drivers "unlawful," and do not facilitate the orderly flow of traffic. The "basic
speed limit" is the nearest 5 mph increment to the 85th percentile speed.
B. The 10 mile per hour (mph) pace speed is the 10 mph increment that contains
the highest percentage of vehicles. It is a measure of the dispersion of speeds
across the range of the samples surveyed. An accepted practice is to keep the
speed limit within the 10 mph pace while considering the critical speed and
other factors that might require a speed lower than the critical speed.
C. The collision rate for each street segment is compared to average collision rates
that can be reasonably expected to occur on streets and highways in other
jurisdictions, in proportion to the volume of traffic per lane mile. These average
collision rates have been developed by the State of California and are
considered reasonable for use in the City of Arroyo Grande.
RESULTS AND RECOMMENDATIONS
The Engineering and Traffic Survey Forms, presented in Appendix A [ON FILE AT
THE CITY], illustrate results of a thorough evaluation of the available data and
recommend a speed limit for each street segment surveyed. A complete summary of
all recommendations is shown in Table 2. In each case, the recommended speed limit
was consistent with the prevailing behavior as demonstrated by the radar speed
measurements. Typically, a speed limit in the upper range of the 10-mile pace was
selected unless a collision rate significantly higher than expected was discovered or
roadway conditions not readily apparent to the driver were identified. Any segments
with recommended speed limits 5 mph or more below the basic speed limit are fully
explained later in this report.
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The Legislature, in adopting Section 22358.5 of the California Vehicle Code (CVC), has
made it clear that physical conditions, such as width, curvature, grade and surface
conditions, or any other condition readily apparent to a driver, in the absence of other
factors, would not be the basis for special downward speed zoning. In these cases, the
basic speed law (CVC Section 22350) is sufficient to regulate such conditions.
The recommendations contained in this Report are intended to establish prima facie
speed limits. They are not intended to be absolute for all prevailing conditions. All
prima facie speed violations are actually violations of the basic speed law (Section
22350 of California Vehicle Code). This statute states that a person shall not drive a
vehicle at a speed greater than is safe having regard for traffic, roadway, and weather
conditions. A prima facie limit is intended to establish a maximum safe speed under
normal conditions.
Table 1 identifies the street segments with recommended changes in posted speed
limits and Table 2 summarizes the recommendations for all surveyed segments.
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Table 1: Street Segments with Recommended Speed Changes
Table 2: Summary of Recommendations
#STREET FROM TO DIR POSTED
SPEED (MPH)85TH %ILE RECOMMENDED
SPEED (MPH)
City Limits S. Elm St EB 35
City Limits S. Elm St WB 35
Via Las Aguilas Rancho Parkway EB N/A
Via Las Aguilas Rancho Parkway WB 30
Paseo St Printz Rd NB N/A
Paseo St Printz Rd SB N/A
Huasna Rd Wildwood Dr NB 40
Huasna Rd Wildwood Dr SB 40
Traffic Way Pacific Coast Railway Pl EB N/A
Traffic Way Pacific Coast Railway Pl WB 25
Orchard Ave Traffic Way EB N/A
Orchard Ave Traffic Way WB 35
Bakeman Ln S Elm St EB 35
Bakeman Ln S Elm St WB 35
Rancho Pkwy Hidden Oak Rd EB 40
Rancho Pkwy Hidden Oak Rd WB 40
N Mason St Via La Barranca EB N/A
N Mason St Via La Barranca WB N/A
Le Point St E Branch St NB N/A
Le Point St E Branch St SB N/A
E Grand Ave Blueberry Ave NB 25
E Grand Ave Blueberry Ave SB N/A
S Elm St Gaynfair Tr EB 40
S Elm St Gaynfair Tr WB 40
Fair Oaks Ave Sunrise Tr NB N/A
Fair Oaks Ave Sunrise Tr SB N/A
E Grand Ave Vernon St EB N/A
E Grand Ave Vernon St WB N/A66W BRANCH ST 32.29 30
63 VALLEY RD 41.48 40
59 THE PIKE 37.79 35
47 S COURTLAND ST 32.72 30
40 N MASON ST 25.36 25
36 LE POINT ST 33.22 30
34 JAMES WAY 36.02 35
28 FARROLL AVE 30.34 30
24 FAIR OAKS AVE 29.21 30
14 E CHERRY AVE 35.22 30
9 CORBETT CANYON RD 37.65 35
8 CORBETT CANYON RD 44.01 40
6 CAMINO MERCADO 37.56 35
1 ASH ST 33.88 30
#STREET FROM TO DIR POSTED
SPEED (MPH)85TH %ILE RECOMMENDED
SPEED (MPH)
City Limits S. Elm St EB 35
City Limits S. Elm St WB 35
E Cherry Ave Newsom Springs Rd EB 40
E Cherry Ave Newsom Spring Rd WB 40
Linda Dr El Camino Real NB 35
Linda Dr El Camino Real SB 35
E Grand Ave Linda Dr NB 30
E Grand Ave Linda Dr SB 30
W Branch St Via Las Aguilas EB 30
W Branch St Via Las Aguilas WB N/A
Via Las Aguilas Rancho Parkway EB N/A
Via Las Aguilas Rancho Parkway WB 30
5 CAMINO MERCADO 33.34 30
6 CAMINO MERCADO 37.56 35
3 BRISCO RD 35.15 35
4 BRISCO RD 29.11 30
1 ASH ST 33.88 30
2 BRANCH MILL RD 43.38 40
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#STREET FROM TO DIR POSTED
SPEED (MPH)85TH %ILE RECOMMENDED
SPEED (MPH)
Printz Rd City Limits NB 45
Printz Rd City Limits SB 45
Paseo St Printz Rd NB N/A
Paseo St Printz Rd SB N/A
Huasna Rd Wildwood Dr NB 40
Huasna Rd Wildwood Dr SB 40
Garden St Huasna Rd EB N/A
Garden St Huasna Rd WB 30
Garden St Paulding Cir EB 30
Garden St Paulding Cir WB 30
Bridge St Mason St EB 25
Bridge St Mason St WB 25
Pacific Coast Railway Pl Branch Mill Rd EB N/A
Pacific Coast Railway Pl Branch Mill Rd WB 35
Traffic Way Pacific Coast Railway Pl EB N/A
Traffic Way Pacific Coast Railway Pl WB 25
Oak St 101 North Off-Ramp EB 35
Oak St 101 North Off-Ramp WB 35
Alpine St Oak St EB 35
Alpine St Oak St WB 35
Brisco Rd Alder St EB 35
Brisco Rd Alder St WB 35
Courtland St Elm St EB 35
Courtland St Elm St WB 35
Oak Park Blvd Robles Rd EB 45
Oak Park Blvd Robles Rd WB 45
Robles Rd Stonecrest Dr EB N/A
Robles Rd Stonecrest Dr WB 40
Stonecrest Dr Brisco Rd EB 40
Stonecrest Dr Brisco Rd WB N/A
N Halcyon Rd Bennett Ave EB 35
N Halcyon Rd Bennett Ave WB 35
Bennett Ave Cornwall Ave NB 35
Bennett Ave Cornwall Ave SB 35
Orchard Ave Traffic Way EB N/A
Orchard Ave Traffic Way WB 35
Valley Rd California St EB 35
Valley Rd California St WB 35
Valley Rd S Halcyon Rd EB 40
Valley Rd S Halcyon Rd WB 40
S Elm St Victorian Ct EB 30
S Elm St Victorian Ct WB 30
Bakeman Ln S Elm St EB 35
Bakeman Ln S Elm St WB 35
N Rodeo Dr S Rodeo Dr NB 35
N Rodeo Dr S Rodeo Dr SB 35
Corbett Canyon Rd Stagecoach Rd EB 40
Corbett Canyon Rd Stagecoach Rd WB 40
29 GRACE LN 37.17 (38.95)35
30 HUASNA RD 40.43 40
27 FARROLL AVE 35.06 (36.31)30
28 FARROLL AVE 30.34 30
25 FAIR OAKS AVE 35.73 35
26 FAIR OAKS AVE 43.09 40
23 EL CAMINO REAL 35.63 35
24 FAIR OAKS AVE 29.21 30
21 EL CAMINO REAL 43.58 (41.59)40
22 EL CAMINO REAL 37.79 35
19 EL CAMINO REAL 46.26 45
20 EL CAMINO REAL 41.59 40
17 E GRAND AVE 39.88 35
18 E GRAND AVE 38.98 35
15 E GRAND AVE 37.64 35
16 E GRAND AVE 37.71 35
13 E CHERRY AVE 34.78 35
14 E CHERRY AVE 35.22 30
11 E BRANCH ST 35.24 30
12 E BRANCH ST 22.25 25
9 CORBETT CANYON RD 37.65 35
10 E BRANCH ST 32.33 30
7 CORBETT CANYON RD 50.31 45
8 CORBETT CANYON RD 44.01 40
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#STREET FROM TO DIR POSTED
SPEED (MPH)85TH %ILE RECOMMENDED
SPEED (MPH)
Stagecoach Rd City Limits EB 45
Stagecoach Rd City Limits WB 45
Oak Park Blvd Equestrian Way EB 40
Oak Park Blvd Equestrian Way WB 40
Equestrian Way Rancho Pkwy EB 40
Equestrian Way Rancho Pkwy WB 40
Rancho Pkwy Hidden Oak Rd EB 40
Rancho Pkwy Hidden Oak Rd WB 40
Hidden Oak Rd Tally Ho Rd EB 35
Hidden Oak Rd Tally Ho Rd WB 35
N Mason St Via La Barranca EB N/A
N Mason St Via La Barranca WB N/A
E Grand Ave Brighton St NB 25
E Grand Ave Brighton St SB 25
E Grand Ave End of Cul de Sac NB 25
E Grand Ave End of Cul de Sac SB 25
E Grand Ave Bennett Ave NB 35
E Grand Ave Bennett Ave SB N/A
Le Point St E Branch St NB N/A
Le Point St E Branch St SB N/A
Farroll Ave Naples St NB 35
Farroll Ave Naples St SB 35
42 OAK PARK BLVD W Branch St James Way NB 40 42.04 40
43 OAK PARK BLVD James Way Meadowlark Dr NB 40 41.1 40
W Branch St Camino Mercado NB 35
W Branch St Camino Mercado SB 35
Camino Mercado Palos Secos NB 40
Camino Mercado Palos Secos SB 40
Palos Secos Refugio Pl NB 40
Palos Secos Refugio Pl SB 40
E Grand Ave Blueberry Ave NB 25
E Grand Ave Blueberry Ave SB N/A
Blueberry Ave Ash St NB 25
Blueberry Ave Ash St SB 25
E Grand Ave Maple St NB 35
E Grand Ave Maple St SB 35
Ash St Fair Oaks Ave NB 25
Ash St Fair Oaks Ave SB 25
Fair Oaks Ave Farroll Ave NB 30
Fair Oaks Ave Farroll Ave SB 30
The Pike City Limits NB 35
The Pike City Limits SB 35
Park Way Dodson Way NB 35
Park Way Dodson Way SB 35
Dodson Way Fair Oaks Ave NB 40
Dodson Way Fair Oaks Ave SB 40
Fair Oaks Ave The Pike NB 40
Fair Oaks Ave The Pike SB 40
Printz Rd James Way NB 35
Printz Rd James Way SB 35
James Way Via La Barranca NB 30
James Way Via La Barranca SB 3057TALLY HO RD 31.14 30
55 S HALCYON RD 40.36 40
56 TALLY HO RD 35.99 35
53 S HALCYON RD 37.84 35
54 S HALCYON RD 38.23 35
51 S ELM ST 31.53 30
52 S ELM ST 37.39 35
49 S ELM ST 38.27 35
50 S ELM ST 29.87 25
47 S COURTLAND ST 32.72 30
48 S COURTLAND ST 27.97 25
45 RANCHO PKWY 43.57 40
46 RANCHO PKWY 43.27 40
41 OAK PARK BLVD 37.88 35
44 RANCHO PKWY 36.87 35
39 N HALCYON RD 33.8 35
40 N MASON ST 25.36 25
37 N COURTLAND ST 30.06 25
38 N ELM ST 28.42 25
35 JAMES WAY 38.58 35
36 LE POINT ST 33.22 30
33 JAMES WAY 43.84 40
34 JAMES WAY 36.02 35
31 HUASNA RD 45.39 45
32 JAMES WAY 40.73 40
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SEGMENTS WITH SPECIAL CONDITIONS
The following segments surveyed had recommended speed limits that were 5 miles
per hour or more below the critical speed due to conditions not readily apparent to the
driver. Each segment is discussed in further detail.
Segment #7- Corbett Canyon Road – From Printz Road to To City Limits
• Current Posted Speed Limit : 45 MPH
• 85th Percentile Calculation: 50.31 MPH
• Recommended Speed Limit: 45 MPH
Justification: 5 MPH reduction applied. Low visibility on horizontal curve. Driveways
to residential homes.
Segment #11- E Branch Street – From Garden Street to Paulding Circle
• Current Posted Speed Limit : 30 MPH
• 85th Percentile Calculation: 35.24 MPH
• Recommended Speed Limit: 30 MPH
Justification: 5 MPH reduction applied. Neighboring segments are 30 MPH going
eastbound and 25 going westbound This will create potential problems for vehicles
transitioning from a higher speed to a lower speed. Vertical curve is present.
#STREET FROM TO DIR POSTED
SPEED (MPH)85TH %ILE RECOMMENDED
SPEED (MPH)
Del Sol St S Elm St EB 35
Del Sol St S Elm St WB 35
S Elm St Gaynfair Tr EB 40
S Elm St Gaynfair Tr WB 40
Gaynfair Tr S Halcyon Rd EB 40
Gaynfair Tr S Halcyon Rd WB 40
W Branch St Fair Oaks Ave NB N/A
W Branch St Fair Oaks Ave SB 35
Fair Oaks Ave SB HWY 101 On Ramp NB 35
Fair Oaks Ave SB HWY 101 On Ramp SB 35
Fair Oaks Ave Sunrise Tr NB N/A
Fair Oaks Ave Sunrise Tr SB N/A
Sunrise Tr Tiger Tail Dr NB 40
Sunrise Tr Tiger Tail Dr SB 40
101 North Off-Ramp Bridge St EB 25
101 North Off-Ramp Bridge St WB N/A
E Grand Ave Vernon St EB N/A
E Grand Ave Vernon St WB N/A
Vernon St Old Ranch Rd EB 40
Vernon St Old Ranch Rd WB 40
Old Ranch Rd Rodeo Dr EB 40
Old Ranch Rd Rodeo Dr WB N/A
Rancho Pkwy Camino Mercado EB 40
Rancho Pkwy Camino Mercado WB 40
Camino Mercado N Oak Park Blvd EB 40
Camino Mercado N Oak Park Blvd WB 40
69 W BRANCH ST 40.36 40
70 W BRANCH ST 42.37 40
67 W BRANCH ST 41.99 40
68 W BRANCH ST 42.73 40
65 W BRANCH ST 26.25 25
66 W BRANCH ST 32.29 30
63 VALLEY RD 41.48 40
64 VALLEY RD 43.3 40
61 TRAFFIC WAY 35.66 35
62 TRAFFIC WAY 38.2 35
59 THE PIKE 37.79 35
60 THE PIKE 42.91 40
58 THE PIKE 34.75 35
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Segment #14- E Cherry Avenue – From Traffic Way to Pacific Coast Railway
• Current Posted Speed Limit: 25 MPH
• 85th Percentile Calculation: 35.22 MPH
• Recommended Speed Limit: 30 MPH
Justification: 5 MPH reduction applied. Residential on Westbound side. Development
on Eastbound side. Recommend monitoring “ROAD WORK” traffic control during
construction. Once development is completed an E&TS is recommended to reflect
change in travel patterns/behavior.
Segment #17- E Grand Avenue - From Brisco Road to Alder Street
• Current Posted Speed Limit: 35 MPH
• 85th Percentile Calculation: 39.88 MPH
• Recommended Speed Limit: 35 MPH
Justification: 5 MPH reduction applied. The adjacent segments shows travel behavior
at 35 MPH, for consistency in travel flow it is recommended to maintain the same
speed limit through this corridor.
Segment #27 Farroll Avenue - From S Elm Street to Victorian Court
• Current Posted Speed Limit: 30 MPH
• 85th Percentile Calculation: 35.06 MPH
• Recommended Speed Limit: 30 MPH
Justification: 5 MPH reduction applied. Residential driveways and sight distance due
to parked vehicles. This leads to a segment of an existing 25 MPH zone adjacent to this
segment.
Segment #33 James Way - From Equestrian Way to Rancho Parkway
• Current Posted Speed Limit: 40 MPH
• 85th Percentile Calculation: 43.84 MPH
• Recommended Speed Limit: 40 MPH
Justification: 5 MPH reduction applied. Horizontal and Vertical curves in this area.
Will keep traffic consistent with Westbound and Eastbound existing speed limits.
Class II Bike lane facility are present in this segment.
Segment #35 James Way - From Hidden Oak Road to Tally Ho Road
• Current Posted Speed Limit: 35 MPH
• 85th Percentile Calculation: 35.40 MPH (east) 40.79 MPH (west)
• Recommended Speed Limit: 35 MPH
Justification: 5 MPH reduction applied. Both directions have parking on both sides.
Residential homes with driveways on both sides.
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Engineering and Traffic Survey
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Segment #37 N Courtland Street - From E Grand Avenue to Brighton Street
• Current Posted Speed Limit: 25 MPH
• 85th Percentile Calculation: 30.06 MPH
• Recommended Speed Limit: 25 MPH
Justification: A senior apartment complex is located on the west side of the roadway.
CVC Section 22352 allows adjustment for roadways adjacent to senior facilities when
“SENIOR" warning signs are in place.
Segment #50 S Elm Street - From Ash Street to Fair Oaks Avenue
• Current Posted Speed Limit: 25 MPH
• 85th Percentile Calculation: 29.87 MPH
• Recommended Speed Limit: 25 MPH
Justification: A senior apartment complex is located on the east side of the roadway.
CVC Section 22352 allows adjustment for roadways adjacent to senior facilities when
“SENIOR" warning signs are in place.
Segment #62 Traffic Way - From Fair Oaks Avenue to 101 on Ramp
• Current Posted Speed Limit: 35 MPH
• 85th Percentile Calculation: 40.88 MPH (North) 32.07 (South)
• Recommended Speed Limit: 35 MPH
Justification: 5 MPH reduction applied. Development on north side. Recommend
monitoring “ROAD WORK” traffic control during construction. A traffic signal is
proposed at the intersection of Fair Oaks Ave after E Cherry Development. Once
development is completed an E&TS is recommended to reflect change in travel
patterns/behavior.
Segment #64 Valley Road - From Sunrise Terrace to Tiger Tail Drive
• Current Posted Speed Limit: 40 MPH
• 85th Percentile Calculation: 43.3 MPH
• Recommended Speed Limit: 40 MPH
Justification: 5 MPH reduction applied.
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LEGISLATIVE REFERENCES
APPLICABLE SECTIONS OF CALIFORNIA VEHICLE CODE
SECTION 1. Section 627 of the Vehicle Code:
Section 627.
a) "Engineering and traffic survey," as used in this code, means a survey of
highway and traffic conditions in accordance with methods determined by the
Department of Transportation for use by state and local authorities.
b) An engineering and traffic survey shall include, among other requirements
deemed necessary by the department, consideration of all of the following:
(1) Prevailing speeds as determined by traffic engineering measurements.
(2) Accident records.
(3) Highway, traffic, and roadside conditions not readily apparent to the
driver.
c) When conducting an engineering and traffic survey, local authorities, in
addition to the factors set forth in paragraphs (1) to (3), inclusive, of subdivision
(b) may consider all of the following:
(1) Residential density, if any of the following conditions exist on the
particular portion of highway and the property contiguous thereto,
other than a business district:
A. Upon one side of the highway, within a distance of a quarter of
a mile, the contiguous property fronting thereon is occupied by 13
or more separate dwelling houses or business structures.
B. Upon both sides of the highway, collectively, within a distance
of a quarter of a mile, the contiguous property fronting thereon is
occupied by 16 or more separate dwelling houses or business
structures.
C. The portion of highway is longer than one-quarter of a mile but
has the ratio of separate dwelling houses or business structures to
the length of the highway described in either subparagraph (A) or
(B).
(2) Pedestrian and bicyclist safety.
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Basic Speed Law
CVC Section 22350.
No person shall drive a vehicle upon a highway at a speed greater than is reasonable
or prudent having due regard for weather, visibility, the traffic on, and the surface and
width of, the highway, and in no event at a speed which endangers the safety of
persons or property.
Speed Law Violations
CVC Section 22351.
(a) The speed of any vehicle upon a highway not in excess of the limits specified in
Section 22352 or established as authorized in this code is lawful unless clearly
proved to be in violation of the basic speed law.
(b) The speed of any vehicle upon a highway in excess of the prima facie speed
limits in Section 22352 or established as authorized in this code is prima facie
unlawful unless the defendant establishes by competent evidence that the speed
in excess of said limits did not constitute a violation of the basic speed law at
the time, place and under the conditions then existing.
Prima Facie Speed Limits
CVC Section 22352.
The prima facie limits are as follows and shall be applicable unless changed as
authorized in this code and, if so changed, only when signs have been erected giving
notice thereof:
(a) Fifteen miles per hour:
(1) When traversing a railway grade crossing, if during the last 100
feet of the approach to the crossing the driver does not have a clear
and unobstructed view of the crossing and of any traffic on the
railway for a distance of 400 feet in both directions along such
railway. This subdivision does not apply in the case of any railway
grade crossing where a human flagman is on duty or a clearly
visible electrical or mechanical railway crossing signal device is
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installed but does not then indicate the immediate approach of a
railway train or car.
(2) When traversing any intersection of highways, if during the last
100 feet of the driver's approach to the intersection, the driver
does not have a clear and unobstructed view of the intersection
and of any traffic upon all of the highways entering the
intersection for a distance of 100 feet along all those highways,
except at an intersection protected by stop signs or yield right-of-
way signs or controlled by official traffic control signals.
(3) On any alley.
(b) Twenty-five miles per hour:
(1) On any highway other than a state highway, in any business or
residence district unless a different speed is determined by local
authority under procedures set forth in this code.
(2) When approaching or passing a school building or the grounds
thereof, contiguous to a highway and posted with a standard
"SCHOOL" warning sign, while children are going to or leaving
the school either during school hours or during the noon recess
period. The prima facie limit shall also apply when approaching
or passing any school grounds which are not separated from the
highway by a fence, gate or other physical barrier while the
grounds are in use by children and the highway is posted with a
standard "SCHOOL" warning sign. For purposes of this
subparagraph, standard "SCHOOL" warning signs may be placed
at any distance up to 500 feet away from school grounds.
(3) When passing a senior center or other facility primarily used by
senior citizens, contiguous to a street other than a state highway
and posted with a standard "SENIOR" warning sign. A local
authority may erect a sign pursuant to this paragraph when the
local agency makes a determination that the proposed signing
should be implemented. A local authority may request grant
funding from the Active Transportation Program pursuant to
Chapter 8 (commencing with Section 2380) of Division 3 of the
Streets and Highways Code, or any other grant funding available
to it, and use that grant funding to pay for the erection of those
signs, or may utilize any other funds available to it to pay for the
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Engineering and Traffic Survey
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erection of those signs, including, but not limited to, donations
from private sources.
Increase of Local Speed Limits to 65 Miles Per Hour
CVC Section 22357.
(a) Whenever a local authority determines upon the basis of an engineering and
traffic survey that a speed greater than 25 miles per hour would facilitate the
orderly movement of vehicular traffic and would be reasonable and safe upon
any street other than a state highway otherwise subject to a prima facie limit of
25 miles per hour, the local authority may by ordinance determine and declare
a prima facie speed limit of 30, 35, 40, 45, 50, 55 or 60 miles per hour or a
maximum speed limit of 65 miles per hour, whichever is found most
appropriate to facilitate the orderly movement of traffic and is reasonable and
safe. The declared prima facie or maximum speed limit shall be effective when
appropriate signs giving notice thereof are erected upon the street and shall not
thereafter be revised except upon the basis of an engineering and traffic survey.
This section does not apply to any 25-mile-per-hour prima facie limit which is
applicable when passing a school building or the grounds thereof or when
passing a senior center or other facility primarily used by senior citizens.
(b) This section shall become operative on the date specified in subdivision (c) of
Section 22366.
Downward Speed Zoning
CVC Section 22358.5.
It is the intent of the Legislature that physical conditions such as width, curvature,
grade and surface conditions, or any other condition readily apparent to a driver, in
the absence of other factors, would not require special downward speed zoning, as the
basic rule of Section 22350 is sufficient regulation as to such conditions.
Boundary Line Streets
CVC Section 22359.
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With respect to boundary line streets and highways where portions thereof are within
different jurisdictions, no ordinance adopted under Sections 22357 and 22358 shall be
effective as to any such portion until all authorities having jurisdiction of the portions
of the street concerned have approved the same. This section shall not apply in the
case of boundary line streets consisting of separate roadways within different
jurisdictions.
Speed Trap Prohibition
CVC Section 40801.
No peace officer or other person shall use a speed trap in arresting, or participating or
assisting in the arrest of, any person for any alleged violation of this code nor shall any
speed trap be used in securing evidence as to the speed of any vehicle for the purpose
of an arrest or prosecution under this code.
Speed Trap
CVC Section 40802.
(a) A "speed trap" is either of the following:
(1) A particular section of a highway measured as to distance and with
boundaries marked, designated, or otherwise determined in order that
the speed of a vehicle may be calculated by securing the time it takes
the vehicle to travel the known distance.
(2) A particular section of a highway with a prima facie speed limit that is
provided by this code or by local ordinance under paragraph (1) of
subdivision (b) of Section 22352, or established under Section 22354,
22357, 22358 or 22358.3, if that prima facie speed limit is not justified
by an engineering and traffic survey conducted within five years
prior to the date of the alleged violation, and enforcement of the
speed limit involves the use of radar or any other electronic device
that measures the speed of moving object. This paragraph does not
apply to a local street, road, or school zone.
(b)(1) For purposes of this section, a local street or road is one that is functionally
classified as “local” on the “California Road Systems Maps,” that are approved
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by the Federal Highway Administration and maintained by the Department
of Transportation. When a street or road does not appear on the “California
Road System Maps,” it may be defined as a “local street or road” if it primarily
provides access to abutting residential property and meets the following three
conditions:
(A) Roadway width of not more than 40 feet.
(B) Not more than one-half mile of an uninterrupted length. Interruptions
shall include official traffic control devices as defined in Section 445.
(C) Not more than one traffic lane in each direction.
(2) For purposes of this section "school zone" means that area approaching or
passing a school building or the grounds thereof that is contiguous to a
highway and on which is posted a standard "SCHOOL" warning sign,
while children are going to or leaving the school either during school hours
or during the noon recess period. "School zone" also includes the area
approaching or passing any school grounds that are not separated from
the highway by a fence, gate, or other physical barrier while the grounds
are in use by children if that highway is posted with a standard "SCHOOL"
warning sign.
(c)(1) When all the following criteria are met, paragraph (2) of this subdivision shall
be applicable and subdivision (a) shall not be applicable:
(A) When radar is used, the arresting officer has successfully completed a
radar operator course of not less than 24 hours on the use of police
traffic radar, and the course was approved and certified by the
Commission on Peace Officer Standards and Training.
(B) When laser or any other electronic device is used to measure the speed
of moving objects, the arresting officer has successfully completed the
training required in subparagraph (A) and an additional training
course of not less than two hours approved and certified by the
Commission on Peace Officer Standards and Training.
(C)(i) The prosecution proved that the arresting officer complied with
subparagraphs (A) and (B) and that an engineering and traffic
survey has been conducted in accordance with subparagraph (B) of
paragraph (2). The prosecution proved that, prior to the officer
Item 12.a. - Page 32
Engineering and Traffic Survey
for the City of Arroyo Grande 21
issuing the notice to appear, the arresting officer established that the
radar, laser, or other electronic device conformed to the
requirements of subparagraph (D).
(ii) The prosecution proved the speed of the accused was unsafe for the
conditions present at the time of alleged violation unless the
citation was for a violation of Section 22349, 22356, or 22406.
(D) The radar, laser, or other electronic device used to measure the speed of
the accused meets or exceeds the minimal operational standards of the
National Traffic Highway Safety Administration, and has been
calibrated within the three years prior to the date of the alleged
violation by an independent certified laser or radar repair and testing
or calibration facility.
(2) A "speed trap" is either of the following:
(A) A particular section of a highway measured as to distance and with
boundaries marked, designated, or otherwise determined in order that
the speed of a vehicle may be calculated by securing the time it takes
the vehicle to travel the known distance.
(B)(i) A particular section of a highway or state highway with a prima facie
speed limit that is provided by this code or by local ordinance under
paragraph (1) of subdivision (b) of Section 22352, or established under
Section 22354, 22357, 22358, or 22358.3, if that prima facie speed limit
is not justified by an engineering and traffic survey conducted within
one of the following time periods, prior to the date of the alleged
violation, and enforcement of speed limit involves the use of radar or
any other electronic device that measures the speed of moving objects:
(I) Except as specified in subclause (II), seven years.
(II) If an engineering and traffic survey was conducted more than
seven years prior to the date of the alleged violation, and a
registered engineer evaluates the section of the highway and
determines that no significant changes in roadway or traffic
conditions have occurred, including, but not limited to,
changes in adjoining property or land use, roadway width, or
Item 12.a. - Page 33
Engineering and Traffic Survey
for the City of Arroyo Grande 22
traffic volume, 10 years.
(ii) This subparagraph does not apply to a local street, road, or school zone.
Speed Trap Evidence
CVC Section 40803.
a) No evidence as to the speed of a vehicle upon a highway shall be admitted in
any court upon the trial of any person in any prosecution under this code upon
a charge involving the speed of a vehicle when the evidence is based upon or
obtained from or by the maintenance or use of a speedtrap.
b) In any prosecution under this code of a charge involving the speed of a vehicle,
where enforcement involves the use of radar or other electronic devices which
measure the speed of moving objects, the prosecution shall establish, as part of
its prima facie case, that the evidence or testimony presented is not based upon
a speed trap as defined in paragraph (2) of subdivision (a) of Section 40802.
c) When a traffic and engineering survey is required pursuant to paragraph (2) of
subdivision (a) of Section 40802, evidence that a traffic and engineering survey
has been conducted within five years of the date of the alleged violation or
evidence that the offense was committed on a local street or road as defined in
paragraph (2) of subdivision (a) of Section 40802 shall constitute a prima facie
case that the evidence or testimony is not based upon a speed trap as defined in
paragraph (2) subdivision (a) of Section 40802.
Item 12.a. - Page 34
Engineering and Traffic Survey
for the City of Arroyo Grande 23
City of Arroyo Grande
Engineering and Traffic Survey
APPENDIX
TABLE OF CONTENTS
A ................... Radar Speed Distribution
B ................... Collision Rates
C ................... Average Daily Traffic Volumes
D................... Speed Survey Segments Map (Attachment 2) & (Attachment 3)
Item 12.a. - Page 35
Engineering and Traffic Survey
for the City of Arroyo Grande 24
APPENDIX A
Radar Speed Distribution
Item 12.a. - Page 36
Engineering and Traffic Survey
for the City of Arroyo Grande 25
APPENDIX B
Collision Rates
Item 12.a. - Page 37
Engineering and Traffic Survey
for the City of Arroyo Grande 26
APPENDIX C
Average Daily Traffic (ADT) Volumes
Item 12.a. - Page 38
Engineering and Traffic Survey
for the City of Arroyo Grande 27
APPENDIX D
Speed Survey Segments Map (Attachment 2) & (Attachment 3)
Item 12.a. - Page 39
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SPEED SURVEY 2018
THIS MAP DISPLAYS STREET SEGMENTS SURVEYED AS PART OF THE 2016 AND 2018
SPEED SURVEY EFFORTS. SEGMENTS ARE LABELED BY SEGMENT ID. APPROXIMATE
RADAR LOCATIONS ARE ALSO SHOWN FOR REFERENCE.
CITY OF ARROYO GRANDE
COMMUNITY DEVELOPMENT DEPARTMENT | ENGINEERING DIVISION
SURVEY SEGMENTS AND APPROXIMATE RADAR LOCATIONS
SURVEY SEGMENTS
CITY LIMITS
2016 RADAR LOCATIONS
2018 RADAR LOCATIONS
G 0 0.5 10.25 0.75 MILES N ELM STN COURTLAND STW B
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CREATED BY: C. KARAMANLIS; PROGRAM ANALYST; NOV. 2018
ATTACHMENT 2
Item 12.a. - Page 40
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51
52
53
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55
56
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58 59 60
61
62
63
64
656667
68
69
70
SPEED SURVEY 2018
THIS MAP DISPLAYS STREET SEGMENTS SURVEYED AS PART OF THE 2016 AND 2018
SPEED SURVEY EFFORTS. SEGMENTS ARE LABELED BY SEGMENT ID. ADJACENT
PARCEL LAND USE FOR EACH SEGMENT IS ALSO SHOWN FOR REFERENCE.
CITY OF ARROYO GRANDE
COMMUNITY DEVELOPMENT DEPARTMENT | ENGINEERING DIVISION
SURVEY SEGMENTS AND ADJACENT PARCEL LAND USE
SURVEY SEGMENTS
CITY LIMITS
LAND USE CATEGORIES
AGRICULTURE
CONSERVATION OPEN SPACE
COMMUNITY FACILITIES
SINGLE FAMILY VERY LOW DENSITY
SINGLE FAMILY LOW DENSITY
SINGLE FAMILY LOW-MEDIUM DENSITY
SINGLE FAMILY MEDIUM DENSITY
MULTI-FAMILY MEDIUM-HIGH DENSITY
MULTI-FAMILY HIGH DENSITY
MULTI-FAMILY VERY HIGH DENSITY
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CREATED BY: C. KARAMANLIS; PROGRAM ANALYST; NOV. 2018
ATTACHMENT 3
Item 12.a. - Page 41
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