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Accident History
Review of the City's accident maps and files indicates that no accidents have
occured at this intersection within the past two years. The accident warrant
requires five or more accidents of a type correctable by stop signs within a 12-
month period. Therefore, the accident warrant is not satisfied.
Visibility
The visibility warrant requires 160 feet clear visibility in all directions. When
measured from the proposed new limit line on Silvergate Drive, visibility in both
directions on Dublin Boulevard slightly exceeded 160 feet. Therefore, the
visibility warrant is not met. However, this warrant is theoretically based on
residential neighborho6ds with speeds of 25 to 30 mph. The posted speed limit on
the eastbound Dublin Boulevard approach is 40 mph. The safe stopping distance on
wet pavement at 40 mph is calculated at 325 feet. Therefore, although the standard
warrant for visibility has not been satisfied, other sight distance conditions may
still warrant a stop sign.
Other Issues
While the minor street (Silvergate Drive) traffic volume does not meet the warrant
for all-way stop sign control, southbound drivers on Silvergate Drive are accustomed
to having eastbound drivers on Dublin Boulevard come to a stop. Staff feels that
removal of the eastbound control (in other words, a one-way stop on Silvergate only)
could result in accidents if the Silvergate motorists continued to expect eastbound
drivers to stop.
The addition of the westbound stop sign would assist in assigning right-of-way at
this intersection.
Recommendation
Staff recommends that the City Council conduct a public hearing, deliberate, and
adopt the resolution approving installation of stop signs on Dublin Boulevard at
Silvergate Drive, to become effective with construction of the Capital Improvement
Project.
a:(corres)\apr\afstdsss
Page 2
RESOLUTION NO. -92
A RESOLUTION OF THE CITY COUNCIL
OF THE CITY OF DUBLIN
APPROVING INSTALLATION OF STOP SIGNS ON DUBLIN BOULEVARD
AT SILVERGATE DRIVE
The City Council of the City of Dublin hereby resolves as follows:
Section 1: Pursuant to City of Dublin Municipal Code Section 6.04.060, and in
the interest of public safety, a stop sign shall be erected on westbound Dublin
Boulevard at ~he intersection of Silverga~e Drive. (The effect of this approval
will create a three-way stop at the Dublin Boulevard/Silvergate Drive intersection.)
Section 2' Said stop sign shall be added to Section 6.16.010 of the City of
Dublin Traffic Code.
PASSED, APPROVED, AND ADOPTED this 27th day of April, 1992.
AYES:
NOES:
ABSENT:
Mayor
ATTEST:
Gity Clerk
a: ~corres) \apr\resodsss
DATE:
TO:
FROM:
SUBJECT:
April 10, 1992
Mehran Sepehri
Carl D. Springer, Christopher S. Kinzel
Dublin Boulevard]Silvergate Drive STOP Sign Warrant Analysis
This is to present the results of TJIGWs analysis related to STOP sign control at the
intersection of Dublin Boulevard/Silvergate Drive in the City of Dublin.
The three-legged intersection is unconventionally configured, with STOP sign control on the
eastbound approach of Dublin Boulevard and on the Sflvergate Drive approach. A
northward-bending concrete median on Dublin Boulevard causes the movement from
westbound Dublin Boulevard to northbound Silvergate to act as a through movement;
westbound vehicles on Dublin Boulevard must turn left to continue west on Dublin
Boulevard. The City is planning to rebuild the intersection with a configuration more like
a conventional "T"-intersection, with east-west through traffic on Dublin Boulevard
ch~nnelized as through movements instead of turn movements. In the future, the
intersection is planned to be widened and signalized as part of improvements related to
development in West Dublin. The purpose of this study was to evaluate what kind of control
is needed in the interim. Three intersection control schemes are possible:
· One-way STOP control: a STOP sign on the Silverga~e Drive approach only.
· Two-way STOP control: STOP signs on Silvergate Drive approach and the Dublin
Boulevard eastbound approach, similar to the existing configuration.
Three-way STOP control: STOP signs on all three approaches to the intersection.
TJKM conducted 24-hour machine volume counts at the intersection between Friday, March
12, and Tuesday, March 18, 1992. The need for three-way STOP sign control on Dublin
Boulevard under the proposed configuration was evaluated based on the stop sign warrants
presented in Attachment A. The following discussion looks at each of the warrants in turn.
Warrant 1: Volumes (300 vehicles per hour entering intersection for an 8-hour
period)
The 24-hour machine counts revealed that the highest 8-hour vehicular volume entering the
intersection was 3,679 vehicles, an average of 460 vehicles per hour. Therefore, the first half
of Warrant I is satisfied. However, the volume approaching the intersection from Silvergate
Drive during the snme 8 hours was only 892 vehicles, or 112 vehicles per hour. This is less
Mehran Sepehri -2- April 10, 1992
than the required one-third of the total volume entering the intersection during the highest
8 hours. (Refer to Table I for more details on current volumes.) Therefore, the current
volume does not fully satisfy this warrant.
Table I
Highest Hourly Voh~rnes at
Intersection of Dublin Boulevard/Silvergate Drive
Hour Dublin Boulevard Silvergate Drive Total
Starting At WB EB SB Volume
7:00 a.m. 121 130 224 475
8:00 227 290 143 660
9:00 113 90 88 291
3:00 p.m. 208 239 98 545
4:00 202 115 78 395
5:00 265 177 99 541
6:00 229 110 95 434
7:00 179 92 67 338
Total 1,544 1,243 892 3,679
Average 193 155 112 460
Note: Traffic count taken March 17, 1992
Warrant 2: Accidents (5 correctable accidents in a 12-month period)
Discussion with City staff and perusal of the City spot accident map indicate that no
accidents have occurred at the intersection within the past two years. This warrant requires
five or more accidents of types capable of correction by STOP signs within a 12-month period.
Therefore, the accident warrant is not met.
Warrant 3: Visibility (Greater than 160 feet in each direction)
The sight distances on both Dublin Boulevard approaches to the intersection were measured
from the planned Silvergate limit line. Visibility in both directions would slightly exceed 160
feet. Therefore, this warrant is not met. However, this warrant is most likely based on low,
residential speeds between 25 and 30 mph. The posted speed on the eastbound Dublin
Boulevard approach is 40 mph. The Institute of Traffic Engineers' Transportation and Traffic
Engineering Handbook (2nd Edition, 1982) states that 325 feet is a safe stopping sight
distance for a travel speed of 40 mph on wet pavement. The sight distances for both Dublin
Mehran Sepehri -3- April 10, 1992
Boulevard approaches under the planned configuration would be less than 325 feet.
Therefore, although the City's warrant is met at this intersection, sight distance
considerations may still warrant a STOP sign.
Other Issues
Because a STOP sign on the westbound approach would be new and therefore ~,,~familiar,
TJKM recommends that a W17 (pictorial "STOP AHEAD) sign be installed 350 feet in
advance of the intersection on this approach.
Summary and Conclusions
The City's warrants for STOP sign installations were reviewed based on the current vehicular
activity and historical safety information. It was found that:
· The current hourly traffic volumes do not meet the total required.
· There were no reported accidents at this location within the last two years.
· Vehicle sight distances will satisfy the City's visibility warrant, but will not
be satisfactory under the proposed configuration.
In conclusion, it is recommended that:
1. Although the City's established STOP sign warrants are not met, it is
recommended that all-way STOP sign control be installed at the intersection
until the intersection is widened and signalized.
2. In addition, TJKM recommends that a W17 (pictorial "STOP AHEAD") sign be
installed 350 feet in advance of the intersection on the westbound Dublin Boulevard
approach.
nk
157-O01m.lk2
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II452I ----
N-s\S
ITY OF DUBLIN
"Celebrating 10 Years Of Cityhood 1982-1992"
RO. Box 234.0, Dublin, Californ:,a 94568
City Offices, 100 Civic Plaza, Dublin, California 94568
PUBLIC HEARING NOTICE
The City of Dublin is preparing to award a construction contract which will change
the Dublin Boulevard/Silvergate Drive intersection to a more normal "T"
configuration. This intersection is currently controlled by stop signs for the
southbound and eastbound directions, with no restriction on westbound traffic.
City Staff has performed a traffic study relative to the "warrants" or criteria for
recommending a three-way stop intersection. These criteria include traffic volumes,
visibility, and accident history. While the warrants for three-way stop control
have not strictly been met at this intersection, City Staff is recommending that a
stop sign be added for westbound traffic in order to improve safety.
A public hearing regarding this matter has been scheduled for the regular City
Council meeting of April 27, 1992, which will be held at 7:30 p.m. in the Council
Chambers, Dublin Civic Center, 100 Civic Plaza, Dublin, California.
The City of Dublin encourages interested parties to attend public meetings and
comment on the issues being discussed. If you wish to provide testimony and are
unable to attend the meeting, written comments which are delivered to the City
Clerk's office prior to the time of the hearing will be made a part of the public
~ecord.
If anyone wishes to challenge ghis matter in court, rhey may be limited to raising
only those issues they or anyone else raised ag the public hearing described in this
notice or in ~ritgen correspondence delivered to the City Olerk at or before the
public hearing.
Questions regarding this issue should be directed to the City of Dublin Public Works
Department at 833-6630.
Administration (510) 833-6650 · City Council (510) 833-6605 · Finance (51 ~.~'
Code Enforcement (510)833-6620 · Engineering (510)833
Police (510) 833-6670 · Public Works (510) 833-6630
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11470 Silvergate Dr
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