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STAFF REPORT C I T Y C L E R K
DUBLIN CITY COUNCIL File # ^~~~-g^~
DATE: September 21, 2010
TO: Honorable Mayor and City Councilmembers
FROM: Joni Pattillo, City Manager
SUBJE . Public Hearing: Review of Engineering Survey Results and Establishment of
Speed Limits for Dublin Boulevard, Central Parkway, Fallon Road and Lockhart
Street
Prepared By: Jaimee Bourgeois, Senior Civi/ Engineer (Traffic)
EXECUTIVE SUMMARY:
This item seeks City Council approval to introduce a proposed ordinance which would establish,
based on the findings of engineering and traffic surveys, new speed limits of 45 mph on Dublin
Boulevard between Tassajara Road and Fallon Road, 35 mph on Central Parkway between
Tassajara Road and Fallon Road, 45 mph on Fallon Road between South City Limit and Bent
Tree Drive, and 30 mph on Lockhart Street between Dublin Boulevard and Gleason Drive.
FINANCIAL IMPACT:
The cost to install new speed limit signs on the four roadways is approximately $2,000. This
can be covered by the Street Maintenance Operating Budget.
RECOMMENDATION:
Staff recommends that the City Council conduct a public hearing, deliberate, waive the reading
and introduce the ordinance amending the Dublin Traffic Code to establish a new speed limit on
portions of Dublin Boulevard (Tassajara Road to Fallon Road), Central Parkway (Tassajara
Road to Fallon Road), Fallon Road (South City Limit to Bent Tree Drive) and Lockhart Street
(Dublin Boulevard to Gleason Drive).
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Submitted By eviewe B
Public Works Director Assistant City Manager
Page 1 of 4 ITEM NO. ~V • I
DESCRIPTION:
Backqround
The California Vehicle Code (CVC) provides that police may use radar for speed enforcement
as long as certain criteria are met. For roadways that are defined as local roads on the federal
roadway classification map or, if not shown on that map, roads that are (1) not more than 40
feet in width, (2) not more than one half mile of uninterrupted length, and (3) not more than one
traffic lane in each direction, a prima facie 25 mph speed limit may be used without performing
a survey. For all other roadways, an engineering and traffic survey (E&TS) is required to
establish a speed limit that can be enforced by means of radar.
The four roadways under consideration include Dublin Boulevard between Tassajara Road and
Fallon Road, Central Parkway befinreen Tassajara Road and Fallon Road, Fallon Road between
South City Limit and Bent Tree Drive and Lockhart Street between Dublin Boulevard and
Gleason Drive (Attachment 1). These roadway segments are relatively new for which the
federal roadway classification map has not yet been updated to reflect the appropriate
classification. Each should be classified as either Collector or Arterial; therefore, an E&TS is
required for each to establish an appropriate speed limit that is enforceable by means of radar.
This staff report discusses the results of the E&TS and the recommended new speed limits for
each roadway. Because these are relatively new roadways, E&TS have not yet been
completed; therefore, none yet have legal enforceable speed limits.
Procedure for Establishinq a Speed Limit
The operative criterion determined by an E&TS is the "85t" percentile" or "critical" speed. This
figure is based on the belief that most drivers will drive at a speed that is safe and reasonable
for conditions. In a sampling of speeds that are taken by radar, 85% of drivers are traveling at
the 85t" percentile speed or lower. Speed limits are to be set at the nearest 5 mph increment to
the critical speed. The second part of the E&TS includes an analysis of the roadway to
determine whether there are any offsetting factors such as residential density, pedestrian and
bicycle features, intersecting driveways, accident history, schools, and so forth, which would
cause the recommended speed limit to be reduced by 5 mph. Engineering surveys are typically
performed during non-commute hours and are not perFormed where roadways are still under
construction or where there are temporary conditions (such as a lane closure or inclement
weather) that would affect a driver's speed.
A Policy Directive was issued by the State of California Department of Transportation in July
2009 that reiterates the standard for establishing speed limits as set forth in the California
Vehicle Code (Sections 627, 22358.8 and 40802). Specifically, it called for clear justification for
the 5 mph reduction in the E&TS. Traffic Commissioners take these E&TS's seriously and may
not uphold citations when the driver is within the 85t" percentile speed. Speed limits that are set
artificially low are said to be "speed traps" and are not enforceable using radar (Attachment 2).
Study Findinqs
The E&TS forms are included with this staff report (Attachments 3, 4, 5 and 6).
Page 2 of 4
Dublin Boulevard (Tassajara Road to Fallon Road): This segment of roadway contains several
45 mph speed limit signs; however, this limit is not based upon the results of an E&TS. The
posted speeds are therefore not enforceable using radar, and the signs were placed in an effort
to encourage reasonable travel speeds. Dublin Boulevard is a major arterial that runs east-west
parallel to and north of I-580. The segment consists of four to six travel lanes with a center
median and signalized traffic controls with separate turn lanes at major intersections. Parking is
prohibited. It is flat and mostly straight with a broad S-curve near the eastern end. The
adjacent land use is a mix of new residential and retail and several vacant parcels. The E&TS
indicates that the critical speed is 44.3 mph, which suggests a posted speed limit of 45 mph (by
rounding to the nearest 5 mph increment). Staff recommends that the posted speed limit be
established at 45 mph so that enforcement by use of radar may commence (Attachment 3).
Central Parkway (Tassaiara Road to Fallon Road): This segment of roadway contains several
35 mph speed limit signs; however, this limit is not based upon the results of an E&TS and is
therefore not enforceable using radar. The signs were placed in an effort to encourage
reasonable travel speeds. Central Parkway is a Class I collector that runs east-west north of
Dublin Boulevard between Arnold Road and Fallon Road. The segment under consideration
consists of finro travel lanes with a center median and signalized traffic controls with separate
turn lanes at major intersections. Parking is allowed along the residential sections of the
roadway, and bike lanes are provided. It is flat and straight from Tassajara Road to Keegan
Street, then moderately graded and curved to Fallon Road. The adjacent land use is primarily
residential with some parcels undeveloped. The E&TS indicates that the critical speed is 37.5
mph, which suggests a posted speed limit of 40 mph (by rounding to the nearest 5 mph
increment). Given the primarily residential character of the roadway and the proximity of the
Fallon Sports Park with associated bicycle and pedestrian traffic, staff recommends that the
posted speed limit be established at 35 mph by applying the optional 5 mph downward speed
zoning (Attachment 4).
Fallon Road (South Citv Limit to Bent Tree Drive): There is no posted speed limit on this
section of roadway. Fallon Road is a major arterial that runs north-south between I-580 to just
north of Signal Hill Drive. Plans include extending the roadway further north to intersect
Tassajara Road. Between I-580 and Dublin Boulevard, Fallon Road contains four travel lanes
and is flat and straight. North of Dublin Boulevard, the roadway has only two travel lanes and it
slopes and curves to Positano Parkway. North of Positano Parkway, there exists five travel
lanes (three northbound and two southbound) and a center median. The roadway contains
signalized traffic controls with separate turn lanes at major intersections. Parking is prohibited.
The adjacent land use is undeveloped between the freeway and Positano Parkway. North of
Positano Parkway, a sports park is located on the west side and non-fronting residential is
located on the east side. The E&TS indicates that the critical speed is between 43.4 and 47.3
mph, which suggests a posted speed limit of 45 mph (by rounding to the nearest 5 mph
increment). Staff recommends that the posted speed limit be established at 45 mph
(Attachment 5).
Lockhart Street (Dublin Boulevard to Gleason Drive): There is no posted speed limit on this
roadway. Lockhart Street is a Class II collector that runs north-south between Dublin Boulevard
and Gleason Drive. The roadway consists of two travel lanes with a center median and no
parking is allowed. Signalized traffic controls exist at the major intersections, and stop signs
exist at Finnian Way. The roadway has a modest grade and curvature between Central
Parkway and Gleason Drive. Between Dublin Boulevard and Central Parkway, a multi-family
residential complex is located west of the roadway, and the east side is vacant. North of
Central Parkway, a sports park exists east of the roadway and a residential development is
Page 3 of 4
planned on the west side with an elementary school currently under construction. The E&TS
indicates that the critical speed is befinreen 29.7 (south of Central Parkway) and 35.1 mph (north
of Central Parkway), which suggests posted speed limits of 30 mph and 35, respectively (by
rounding to the nearest 5 mph increment). Given the proximity of the sports park with
associated bicycle and pedestrian activity and the planned elementary school, staff
recommends that the posted speed limit be established at 30 mph for the entire segment by
applying the optional 5 mph downward speed zoning for the segment north of Central Parkway
(Attachment 6).
Although the E&TS indicates 35.1 mph on Lockhart Street north of Central Parkway and there is
clear justification for reducing the posted speed to 30 mph because of proximity to the new Kolb
Elementary School (due to open in Fall 2011), there is no leeway to lower the speed further
while still maintaining enforceability. Because the roadway is wider than 40 feet a speed survey
is triggered by the CVC as indicated earlier in this report. As a comparison, this proposed
posted speed is commensurate with the example of a posted speed of 35 mph on Village
Parkway fronting along Dublin High School. 25 mph signs are still able to be posted in school
areas and in effect when children are present. Staff will pay attention to the speed along this
roadway once the school has opened, Fallon Sports Park is in full use, and the area has been
further developed.
A draft ordinance is attached (Attachment 7) that would amend the City of Dublin Traffic Code
to establish a new speed limit of 45 mph on Dublin Boulevard between Tassajara Road and
Fallon Road, 35 mph on Central Parkway between Tassajara Road and Fallon Road, 45 mph
on Fallon Road between South City Limit and Bent Tree Drive, and 30 mph on Lockhart Street
between Dublin Boulevard and Gleason Drive.
NOTICING REQUIREMENTS/PUBLIC OUTREACH:
Because there are no direct residential driveways fronting the study roadways, notices were not
sent out.
ATTACHMENTS: 1. Location Map
2. California Vehicle Code Section 40802 "Speed Trap"
3. Engineering and Traffic Survey Form Results - Dublin
Boulevard
4. Engineering and Traffic Survey Form Results - Central
Parkway
5. Engineering and Traffic Survey Form Results - Fallon Road
6. Engineering and Traffic Survey Form Results - Lockhart Street
7. Draft Ordinance amending the Dublin Traffic Code to establish
a new speed limit on portions of Dublin Boulevard (Tassajara
Road to Fallon Road), Central Parkway (Tassajara Road to
Fallon Road), Fallon Road (South City Limit to Bent Tree Drive)
and Lockhart Street (Dublin Boulevard to Gleason Drive)
Page 4 of 5
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LOCATION MAP
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ATTACHMENT I
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V.C. Section 40802 - Speed Traps
Home Paae » Publications » Vehicle Code Title Paae » Vehicle Code Table of Con#ents » Division 17. Chapter 3. Article 1» Section
40802
Speed Traps
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
subparagraph (A) of paragraph (2) of subdivision (a) of Section 22352, or established under Section 22354, 22357, 22358, or
22358.3, ifi 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 violafion, and enforcement of the speed limit involves the use of radar or any other electronic device that
measures the speed of moving objects. 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 defined by the latest functional usage and federal-aid system maps
submitted to the federal Highway Administration, except that when these maps have not been submitted, or when the street or
road is not shown on the maps, a"local street or road" means a street or road that 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 of a mile of uninterrupted length. Interruptions shall include official traffic control signals 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 thaf 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" waming sign.
(c) (1) When all of 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 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 alleaed violatinn
unless the citation was for a violation of Section 22349, 22356, or 22406.
http:,,dm~.~a.go~,pubs,~~top,dl~,v~4ogo2.ht~ ~ ATTACHMENT Z
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:CITY OF DUBLIN :
SPEED LLMtT
ENGINEERfNG / TRAFFIC SURVEY
Street: Dublin Bivd. Limits: between Tassaiara Rd. & Falion Rd.
Length (feet):_ 6,280'
SPEEDS '
Location of Survey:
Date Taken:
Posted Speed:
Pace Speed:
% in Pace, Above, Below
Criticai Speed (85%)
Range of Speeds
Grafton St. to
Lockhart St.
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45 mph
37-46 mph
92; 5; 3
44.3 mph
35-49 m h
ROADWAY DESIGN ~4ND TRAFFIC CHARACTERiSTICS '
Width (ft.): 86'-124' No. of Lanes (Both Directions}: 4-6 (2-3 each with median)
Average Daily Traffic: 7,268 Date Taken: 7/27-28110
Special Conditions (Parking, Roadway Aiignment, Land Use, School Area, etc.): mostlv flat with
broad curve Lockhart St. to Fallon Rd.; median with turn lanes at intersections; no parkinq~
mix of finished multi-tenant residential/commercial properties with access driveways, and vacant
arcels under develo ment on both sides of street~ si nalized control at ma'or cross-streets.
ACCIDENT GHARACTERISTICS '
Accident Period Analyzed: 6/30/07 - 6/30/10
Number of Accidents (List Total and Each Year): 7('07/'08 = 2, '08/'09 = 2, `09/'10 = 3)
Number of Speed Related Accidents (Total and Each Year): 5('7/'8 = 1, '8/'9 = 2, '9/'10 = 2)
Calculated Accident Rate: 0.74 acc./m.v.m. Statewide Average Rate: 1.83
SURVEY RESULTS
Recommendations: The measured critical speed and
roadwav characteristics indicate that a 45 mph speed limit
is appropriate.
Study Prepared By: Omni-Means Enqineers & Planners
Date: 8/10
Approved By:
Date:
Approved Speed Limit:
Per CVC 40803, Survey Expires:
ATTACHMENT 3
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CITY OF DUB~1N
SPEED LIMIT
'ENGINEERING / TRAFFiC SURVEY'
Street: Central Pkwv. Limits: between Tassajara Rd. & Fallon Rd.
Length (feet): 5,960'
SPEEDS
Location of Survey: Grafton St. to
Lockhart St.
Date Taken: 7/23/10
Posted Speed: 35 mph
Pace Speed: 29-38 m h
% in Pace, Above, Below 80; 12; 8
Critical Speed (85%) 37.5 mph
Range of Speeds 25-44 mph
ROADWAY DESIGN AND TRAFFIC CHARACTERISTICS '
Width (ft.): 58'-82' No. of Lanes (Both Directions): 2(1 each with median)
Average Daily Traffic: 1,180 Date Taken: 7/27-28/10
Special Conditions (Parking, Roadway Alignment, Land Use, School Area, etc.): flat with broad
curve Tassajara Rd. to Keegan St, then moderate qrade (EB uphill) to Fallon Rd.; median with
turn lanes at intersections; striped bike lanes and on-street parking lanes Branniqan St. to
Lockhart St.~ mix of finished multi-tenant residential and arcels bein develo ed both sides.
ACCIDENT CHARACTERISTICS :
Accident Period Analyzed: 6/30/07 - 6/30/10
Number of Accidents (List Total and Each Year); 1('07P08 = 1, 'O8/'09 = 0. '09/'10 = 0)
Number of Speed Related Accidents (Total and Each Year): 0('7/'8 = 0, '8/'9 = 0, '9/'10 = 0)
Calculated Accident Rate: 0.68 acc./m.v.m. Statewide Average Rate: 1.78
SURVEY RESULTS
Recommendations: The measured critical speed with an
optional 5 mph reduction and the street characteristics
indicate that 35 mph is appropriate. 5 mph downward
speed zoninq due to bicvcle traffic, proximity to parks
and associated pedestrian activity.
Study Prepared By: Omni-Means Engineers & Planners
Date: 8/10
Approved By:
Date:
Approved Speed Limit:
Per CVC 40803, Survey Expires:
ATTACHMENT ~4
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CITY OF DUBLIN
SPEED LIMIT
ENGINEERING / TRAFFIC SURVEY
Street: Fallon Rd. Limits: between City Limit at freewav and Bent Tree Dr.
Length (feet): 5,540'
SPEEDS
Location of Survey: I-580 freeway to
Dublin Blvd. Dublin Blvd. to
Positano Pkwy. Positano Pkwy.
to Bent Tree Dr.
Date Taken: 7/23/10 7/24/10 7/24/10
Posted Speed: Not Posted Not Posted Not Posted
Pace Speed: 39-48 mph 35-44 mph 35-44 mph
% in Pace, Above, Below 78; 10; 12 76; 15; 9 81; 11; 8
Critical Speed (85%) 47.3 mph 44.0 mph 43.4 m h
Range of Speeds 31-56 mph 30-54 mph 28-53 mph
',ROADWAY DESIGN AND TRAFFIC CHARACTERISTICS
Width (ft.): 30'-110' No. of Lanes (Both Directions): 2-5 (1-3 NB, 1-2 SB)
Average Daily Traffic: 7,289 Date Taken: 7/27-28/10
Special Conditions (Parking, Roadway Alignment, Land Use, School Area, etc.): combination of
straiqht/flat near freeway and qraded (NB uphill) with curves Central Pkwy. to Bent Tree Dr.;
From freeway to Dublin Blvd., and Positano Pkwy. to Bent Tree Dr. is wide with multiple travel
lanes, while seqment in between is narrower with one lane each wav; siqnal control at maior
cross streets; no parkinq; no posted speed limit (yellow advisory speed siqns: "curve 30" SB
a roachin Central P . and "curves 25 m h" NB a roachin Positano Pkw .
ACCIDENT CHARACTERISTICS
Accident Period Analyzed: 6/30/07 - 6/30/10
Number of Accidents (List Total and Each Year): 3('07/'08 = 2, '08/'09 = 0, '09/'10 = 1;
Number of Speed Related Accidents (Total and Each Year): 1('7!'8 = 1, '8/'9 = 0, '9/'10 = 0
Calculated Accident Rate: 0.36 acc./m.v.m. Statewide Average Rate: 1.78
SURVEY RESULTS
Recommendations: The measured critical sqeeds and
roadway characteristics indicate that a 45 mph speed limit
is appropriate.
Study Prepared By:
Date: 8/10
Approved By:
Date:
Approved Speed Limit:
Per CVC 40803, Survey Expires:
Omni-Means Enqineers & Planners
ATTACHMENT 5
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CITY OF DUBLIN
SPEED LlMIT
ENGINEERING ! TRAFFIC SURVEY
Street: Lockhart St. Limits: between Dublin Bivd. and Gleason Dr.
Length (feet): 3,730'
SPEEDS`
Location of Survey: Dublin Bivd. to
Central Pkwy. Central Pkwy.
to Gleason Dr.
Date Taken: 7/24,26/10 7/24,26 8/2/10
Posted Speed: Not Posted Not Posted
Pace Speed: 21-30 mph 28-37 mph
% in Pace, Above, Below 78; 12; 10 84; 6; 10
Critical Speed (85%) 29.7 mph 35.1 mph
Range of Speeds 18-33 mph 18-41 mph
ROADWAY DESIGN AND TRAFFIC CHARACTERISTICS ~
Width (ft.): 58' No. of Lanes (Both Directions): 2(1 each way)
Average Daily Traffic: 974 Date Taken: 7/27-28/10
Special Conditions (Parking, Roadway Alignment, Land Use, School Area, etc.): straight/flat on
south end, then curved & qraded (NB uphill) to Gleason Dr.; center median with turn lanes at
intersections; siqnal control at Central Pkwv. & Gleason Dr.; all-wav stop control at Maguire Wy~
no parkinq; multi-tenant residential on west side between Dublin Bivd. & Central Pkwy,•
elementarv school (west side) and sports park (east side) under construction between Central
P . and Gleason Dr.~ no osted s eed limit.
ACCIDENT CHARACTERISTICS
Accident Period Analyzed: 6/30/07 - 6/30/10
Number of Accidents (List Total and Each Year): 1('07/'08 = 0, '08/'09 = 0, '09/'10 = 1
Number of Speed Related Accidents (Total and Each Year): 1('7/'8 = 0, '8/'9 = 0, '9/'10 = 1
Calculated Accident Rate: 1.32 acc./m.v.m. Statewide Average Rate: 1.78
SURVEY RESULTS
Recommendations: The measured critical speeds with an
optional 5 mph reduction and the street characteristics
indicate that 30 mph is appropriate. 5 mph downward
speed zoninq due to bicvcle and pedestrian safety and
proximity to sports park and school.
Study Prepared By: Omni-Means Enqineers & Planners
Date: 8/10
Approved By:
Date:
Approved Speed Limit:
Per CVC 40803, Survey Expires:
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ORDINANCE NO. -10
AN ORDINANCE OF THE CITY COUNCIL
OF THE CITY OF DUBLIN
~*:~xx*~**
AMENDING THE DUBLIN TRAFFIC CODE TO ESTABLISH A NEW SPEED LIMIT
ON PORTIONS OF DUBLIN BOULEVARD (TASSAJARA ROAD TO FALLON ROAD),
CENTRAL PARKWAY (TASSAJARA ROAD TO FALLON ROAD), FALLON ROAD
(SOUTH CITY LIMIT TO BENT TREE DRIVE) AND LOCKHART STREET (DUBLIN
BOULEVARD TO GLEASON DRIVE)
The City Council of the City of Dublin does hereby ardain as follows:
Section 1: The following language shall be added to Section 6.60.020 (Thirty Miles per
Hour) of the City of Dublin Traffic Code:
"Lockhart Street: Dublin Boulevard to Gleason Drive."
Section 2: The following language shall be added to Section 6.60.030 (Thirty-Five Miles per
Hour) of the City of Dublin Traffic Code:
"Central Parkway: Tassajara Road to Fallon Road."
Section 3: The following language shall be added to Section 6.60.050 (Forty-Five Miles per
Hour) of the City of Dublin Traffic Code:
"Dublin Boulevard: Tassajara Road to Fallon Road" and
"Fallon Road: South City Limit to Bent Tree Drive."
Section 4. Severability. The provisions of this Ordinance are severable and if any provision,
clause, sentence, word ar part thereof is held illegal, invalid, unconstitutional, or inapplicable to
any person or circumstances, such illegality, invalidity, unconstitutionality, ar inapplicability
shall not affect or impair any of the remaining provisions, clauses, sentences, sections, words or
parts thereof of the ordinance or their applicability to other persons or circumstances.
Section 5. Effective Date. This Ordinance shall take effect and be enforced thirty (30) days
following its adoption.
Section 6. Posting. The City Clerk of the City of Dublin shall cause this Ordinance to be
posted in at least three (3) public places in the City of Dublin in accordance with Section 36933
of the Government Code of the State of California.
Pa~e 1 ATTACHMENT ~
~ ~~~
~
PASSED, APPROVED AND ADOPTED this 5'h day of October, 2010.
AYES:
NOES:
ABSENT:
ABSTAIN:
ATTEST:
Mayor
City Clerk
Page 2