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CITY OF DUBLIN
AGENDA STATEMENT
City Council Meeting Date: April 9, 1990
SUBJECT:
Annual Traffic Safety Report and Downtown Intersection
Monitoring Report
(Report by Traffic Engineer Chris Kinzel)
EXHIBITS ATTACHED:
1) Report from TJKM
2) Map of accident locations will be displayed at the
meeting
RECOMMENDATION:
~~ceive
Staff presentation
FINANCIAL STATEMENT:
No cost associated with receiving report. Where
mitigation measures have been recommended by TJKM, the
estimated cost of the improvements is noted in the
Description below.
DESCRIPTION:
During a review of traffic-related matters in 1987, the City Council requested
that Staff prepare an annual analysis of high accident locations, along with
recommendations for corrective measures. The first of these annual reports
was presented in 1988 and was combined with the first "downtown intersection
monitoring" report as per the Downtown Specific Plan recommendations.
Following are synopses of TJKM's reports, which are attached to this agenda
statement in their entirety.
HIGH ACCIDENT LOCATION ANALYSIS:
A review of the last five years of accident records revealed the following
general statistics:
Type of Accident 1985 1986 1987 1988 1989
Property Damage Only 204 224 197 207 202
Injury 65 80 58 62 73
Fatal 0 1 2 0 0
Total Accidents 269 305 257 269 275
TJKM receives copies of accident reports generated by the police department
and plots the accidents by type on a copy of the City's base map. TJKM then
identifies the intersections or street segments with at least five accidents
as shown on the spot map. Also selected for further review were some
locations with less than five accidents but on lightly traveled streets.
After discussion with the City's Traffic Safety Committee, the following
intersections were reviewed:
San Ramon Road Between Alcosta Boulevard and Shannon Avenue
Almost all of the collisions in this portion of San Ramon Road occurred at the
approaches to Vomac Road. This intersection is in the area of transition from
a two-lane roadway on the south to a four-lane roadway to the north. Because
of the single through lane approaches, traffic tends to back up during peak
hours. Fifteen of the sixteen accidents at this location were rear-end
accidents, which are the most common at signalized intersections, and most
occurred during the afternoon peak hour. Phase IV of the San Ramon Road
improvements, which is scheduled to go to bid within the next month, will
create a four-lane roadway south of Vomac Road. This improvement will shorten
the traffic "queues" and lessen the chances of multiple vehicle rear-end
accidents. TJKM recommends installing "Signal Ahead" signs and pavement
-- - - - - -- -- - - - -- -- -- -- -- - - -- - -- --- -- -- -- - -- -- - -- -- ----- - --- --- -- -- - -- -- -- - ---
ITEM NO. B. J
COPIES TO: TJKM
markings in advance of the Vomac Road intersection to warn drivers behind long
lines of traffic. The estimated cost of this improvement is $500.
Dougherty Road and Dublin Boulevard/Scarlett Court
The collision diagram does not show a consistent pattern of accidents. During
the year, the south leg of the intersection was improved as part of the I-580
interchange improvements. There was a reduction in rear-end accidents from
previous years, which may be attributed to the roadway improvements. TJKM has
no further recommendations for improvements at this intersection.
San Ramon Road and Dublin Boulevard
There were 14 accidents reported at this intersection, of which 8 were rear-
enders. Even with increased traffic, this is a reduction in number from the
19 accidents reported in 1988. The roadway and signals are recent, high-
standard installations, and no further improvements are recommended.
Dougherty Road and Sierra Lane
Of the 11 accidents reported at this location, 7 actually occurred away from
the intersection. Six collisions occurred at the Pak-N-Save driveway south of
the intersection. To mitigate this problem, TJKM recommends that only right
turns in and out of that driveway be allowed. Drivers wishing to turn north
onto Dougherty Road would then need to exit either the Dublin Boulevard
driveway or the Sierra Lane driveway and then turn left on Dougherty.
Construction of the recommended raised median or AC berm, including associated
striping and signing, is estimated to cost $1,000. Since Staff also has not
had an opportunity to contact the property owner, it is recommended that this
improvement be deferred until a later date.
Village Parkway and Amador Valley Boulevard
Half of the ten accidents occurring at this signalized intersection were
rear-enders. A field review indicated no obvious mitigation measure; however,
three of four accidents occurring at this intersection in December occurred
during hours of darkness. TJKM recommends monitoring this intersection
through the next year to determine if any mitigation measures are necessary.
Village Parkway and Dublin Boulevard
Most of the accidents occurred away from the intersection at various
locations. No further improvements are recommended at this time.
Regional Street and Amador Valley Boulevard
Nine accidents were reported, of which two actually occurred at the
intersection. All others occurred at adjacent retail driveways. No
improvements are recommended.
Regional Street and Dublin Boulevard
No particular pattern of accidents appears on the collision diagram. The
Traffic Safety Committee has already recommended some guideline striping to
mitigate an offset alignment problem on Regional Street crossing Dublin
Boulevard. No additional improvements are recommended at this time.
Dublin Boulevard and Civic Plaza/Sierra Court
The Traffic Safety Committee requested an investigation of collisions near the
Dublin Sports Grounds. Of four accidents occurring at this location, three
were side-swipes and one was a rear-ender. All occurred prior to August of
1989. Two of the accidents occurred on the same Sunday at the same hour, and
it is assumed these happened during an event at the park while traffic was
circulating. Since the construction of the Civic Center, additional parking
is available, and the need to circulate is lessened. No further improvements
are recommended.
-2-
San Ramon Road and Amador Valley Boulevard
Of seven accidents reported at this intersection, five were rear-enders and
two were side-swipes, which is not unusual for a signalized intersection. No
mitigation is recommended.
Dublin Boulevard and Amador Plaza Road
No particular pattern is apparent among the five accidents reported at this
intersection. No improvements are recommended.
Village Parkway and Kimball Avenue
The Traffic Safety Committee requested a review of the accident reports at
this intersection to determine cause. Of the three accidents reported at this
intersection, two may have been caused by excessive speed. TJKH recommended
no mitigation measures at this location; however, since Kimball Avenue is in
the City of San Ramon, Staff recommends addressing a letter to the City of San
Ra'Jlon requesting the number of accidents at this location reported to the San
Ramon police department and also requesting enforcement of the speed limit.
DOWNTOWN TRAFFIC MONITOKING
The City's Dovmtown Specific Plan specifies that the Traffic Honitoring
Program periodically conduct counts at key locations within and leading to the
downtown area. TJ~1 monitored five intersection locations and compared
current conditions to previous years as snown in the tables in the attached
exhibit.
The intersection with the highest percentage of increase was the Dublin
Boulevard/Village Parkway intersection with a 23.2% increase. This increase
led to the installation of a dual left-turn lane from eastbound Dublin
Boulevard to northbound Village Par~way. The other intersections in the study
showed increases from 0.4% to 5.3% in 1989. The two busiest intersectioas in
the City, Dublin Boulevard at San Kamon Road and Dublin Boulevard at Dougherty
Road, showed a slower growth rate than the previous year. TJKM theorizes that
freeway and road improveJlents in surrounding areas may have caused the
slowdown in growth rate.
Volume-to-capacity (v/e) ratios were calculated for each of the five
intersections to determine levels of service (LOS). These levels have changed
very little at four of the five intersections studied. The improvement frow
LOS D to LOS C at the Dublin Boulevard/Dougherty Road intersection is partly a
result of a change in base capacities used in TJfu~'s calculations. The base
capacities used for the 1990 calculations reflect more closely the actual
signal phasing. TJ~~ feels that the 1989 results were unrealistically high.
-3-
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MEMORANDUM
April 3, 1990
TO: Lee Thompson, City Engineer
FROM: Ty Tekawa, TJKM
SUBJECT: High Accident Location Analysis
TJKM has completed its annual analysis of high accident locations on public streets
in the City of Dublin.
The first task in the selection of the high accident locations was the review of the
accident Spot Map for 1989. This map depicts the location and type of accident on a
base map of the City. The spot map is produced directly from accident reports
prepared by Dublin police officers. These reports are filed by location in TJKM's
office.
A count of the total number of accidents by type was performed. This count was
compared with three previous years. Table 1 is a comparison of numbers of
accidents by type for 1986 through 1989. The total number of accidents increased by
six over 1988 with a decrease in "property damage only" accidents. Injury accidents
increased by nine over the previous year. There were no recorded accidents
resulting in fatalities in 1989.
TJK1\1: identified the intersections or street segments that had at least five accidents
shown on the spot map. Also selected for further review were those locations which
had less than five accidents, but were on lightly traveled streets. TJKM also held a
special meeting of the Dublin Traffic Safety Committee to discuss areas that may
need review based on input from committee members through their observations. A
listing of the locations is shown on Table 2. My comments and recommendations for
each of the listed locations follows.
1. San Ramon Road Between Alcosta Boulevard and Shannon Avenue
Almost all of the collisions in this stretch of San Ramon Road occurred at the
approaches to Vomac Road. The intersection is signalized with separate left turn
signals for traffic on San Ramon Road. There is only one through lane on
San Ramon Road approaching Vomac Road. This intersection is in the area of
transition from a two-lane roadway on the south to a four-lane section toward the
north. Because of these single through lane approaches, long queues are created
during peak hours. Rear-end accidents are the most common at signalized
4637 Chabot Drive, Suite 214, Pleasanton, California 94588· (415) 463-0611
PLEASANTON . SACRAMENTO· FRESNO· CONCORD
Lee Thompson
-2-
April 2, 1990
intersections. The collision diagram shows 15 of the 16 accidents as rear-enders.
Many of the accidents involve more than two vehicles which indicates long queue
lengths. Also, most of the accidents occurred during the afternoon peak hour. Phase
four of the San Ramon Road improvements will create a four-lane roadway north
and south ofVomac Road. This improvement will shorten the queues and lessen the
chances for the multiple vehicle rear-end accidents. To alert the drivers that they
may need to slow down or stop near the intersection, it is recommended that "Signal
Ahead" signs and pavement markings be installed. These should be installed well in
advance of the intersection to warn drivers behind long platoons of traffic.
2. Douqherty Road and Dublin Boulevard/Scarlett Court
The collision diagram does not show a consistent pattern of accidents. During the
year, the south leg of the intersection was improved as a part of the 1-580
interchange improvements. The collision diagram also shows that several of the
accidents did not occur at the intersection. There were more rear-end accidents in
previous years. The reduction in these types of accidents can be attributed to the
roadway improvements. No further improvements are recommended.
3. San Ramon Road and Dublin Boulevard
There were 14 accidents reported at this intersection. Eight of these accidents were
rear-end types. These are common at signalized intersections and are usually
caused by drivers' inattention. The 14 accidents are a reduction in number from 19
reported in 1988. The roadway and the signals are recent high-standard
installations. Even with increased traffic at this intersection, there was a reduction
in accidents, therefore, no further improvements are recommended.
4. Dougherty Road and Sierra Lane
Of the 11 accidents reported at the Dougherty Road and Sierra Lane, 7 actually
occurred away from the intersection. Six of the collisions occurred at the Pak-n-Save
driveway south of the intersection. To mitigate this problem, only right turns in and
out of this driveway should be allowed. Drivers that would want to turn left into or
out of this driveway could use other driveways. Traffic wishing to go northbound on
Dougherty Road could turn left at the signalized Pak-n-Save driveway on Dublin
Boulevard and turn left at the signal on Dougherty Road. They could also use the
existing driveway on Sierra Lane and turn left at the Dougherty Road intersection.
A raised median should be constructed on Dougherty Road to prevent left turn
ingress and egress.
5. Villaqe Parkway and Amador Valley Boulevard
This is a signalized intersection. There were five rear-end accidents among the total
of ten. There were also two collisions caused by vehicles backing into stopped
vehicles. The accidents are typical at signalized intersections. A field review
showed no obvious mitigation measure. However, four of the accidents occurred in
December and three were in hours of darkness. A review of accident reports in
previous years did not reveal a significant pattern of accidents during December nor
Lee Thompson
-3-
April 2, 1990
during hours of darkness. However, it is recommended that this intersection be
monitored through the next year to determine the need for an implementable
improvement.
6. Villaqe Parkway. and Dublin Boulevard
There is no pattern of types of accidents to indicate a need for immediate mitigation.
Most of the accidents occurred away from the intersection at various locations. No
improvements are recommended.
7. Reqional Street and Amador Valley Boulevard
There were nine reported accidents. Only two actually occulTed at the intersection.
Except for a rear-end and a pedestrian accident all others occurred at retail center
driveways. No improvements are recommended.
8. Reqional Street and Dublin Boulevard
No particular pattern of accidents appears on the collision diagram. The Traffic
Safety Committee has already recommended some guideline striping to mitigate an
offset alignment problem on Regional Street crossing Dublin Boulevard. No further
mitigation is recommended.
9. Dublin Boulevard and Civic Plaza/Sierra Court
The Police members of the Traffic Safety Committee requested an investigation of
the collisions near the sports grounds. There were four accidents on Dublin
Boulevard in front of the sports grounds. Three were side-swipe and one was a rear-
end type accident. All of the accidents occulTed before August of 1989. There have
been no accidents reported since then. Two of the accidents in August occurred on
the same Sunday at the same hour. These must have happened during an event at
the sports park while traffic was circulating. Since the construction of the new City
Hall, there are more parking spaces available and the need to circulate is lessened.
Also, since roadway improvements have been completed, there is less driver
confusion. No further improvements are recommended.
10. San Ramon Road and Amador Valley Boulevard
Of the seven accidents reported at this intersection, five were rear-enders. Two
were side-swipes. These types of collisions are not unusual for signalized
intersections. There was only one injury. No mitigation is recommended.
11. Dublin Boulevard and Amador Plaza Road
There were five reported accidents at this intersection. No particular pattern is
evident. The cause of these accidents appears to be driver inattention. No
improvements are recommended.
Lee Thompson
-4-
April 2, 1990
12. Villaqe Parkway and Kimball Avenue
The police representatives of the Traffic Safety Committee requested a review of the
accident reports at this intersection to determine cause. It was suspected that
speeding may be a prime cause of collisions in the area. Of the three accidents
reported at the intersection, two may have been caused by excessive speed. One car
went out of control and hit a fixed object on Village Parkway. The other collision
involved a left turning vehicle and an opposing through vehicle. There were no
injuries. No mitigation is recommended.
sam
Attachments
cc: Chris Kinzel
157-001MA'IT
CITY OF DUBLIN
HIGH ACCIDENT LOCATION ANALYSIS
TABLE 1
TYPE OF ACCIDENT NO. OF ACCIDENTS PER YEAR
1986 1987 1988 1989
PROPERTY DAMAGE ONLY 224 197 207 202
INJURY 80 58 62 73
FATAL 1 2 0 0
TOTAL ACCIDENTS 305 257 269 275
TABLE 2
ACCIDENT STUDY LOCATIONS
LOCATION
1 San Ramon Rd btwn Alcosta Bl & Shannon Av
2 Dougherty Rd & Dublin Bl/Scarlett Ct
3 San Ramon Bl & Dublin Bl
4 Dougherty Rd & Sierra lane
5 Village Pkwy & Amador Valley Bl
6 Village Pkwy & Dublin Bl
7 Regional St & Amador Valley Bl
8 Regional St & Dublin Bl
9 Dublin Bl & Civic Plaza/Sierra Ct
10 San Ramon Rd & Amador Valley Bl
11 Dublin Bl & Amador Plaza Rd
12 Village Pkwy and Kimball Av
accident.tbl
NO. ACCIDENTS
16
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~~ MEMORANDUM
DATE: April 4, 1990
TO: Lee Thompson, City Engineer
FROM: Ty Tekawa, TJKM
SUBJECT: Dublin Downtown Traffic Monitoring
TJKM has completed the traffic counts for the annual downtown traffic monitoring
program. This program is a part of the Downtown Specific Plan adopted in
July 1987. The Plan specifies that the monitoring program consists of traffic counts
taken periodically at key locations within and leading to the downtown area.
Since 1987, five intersections have been monitored annually. P.M. peak hour
turning movement counts were taken at each intersection. Four of the five
intersections were those found to be operating at a level of service (LOS) worse than
A in the Downtown Improvement Plan. These intersections are listed below:
· San Ramon Road and Amador Valley Boulevard
· San Ramon Road and Dublin Boulevard
· Dublin Boulevard and Regional Street
· Dublin Boulevard and Village Parkway
The fifth intersection is Dublin Boulevard and Dougherty Road.
Table 1 summarizes the results of the intersection monitoring from 1987 through
1989. The 1989 data are actually counts taken in February and March of 1990. In
1989, the intersection with the highest percentage increase in traffic was Dublin
Boulevard and Village Parkway (23.2 percent). The average increase in traffic since
1987 has been 13.65 percent. This increase in traffic resulted in the installation of a
two-lane left-turn lane from eastbound Dublin Boulevard to northbound Village
Parkway. The other intersections in the study showed increases from 0.4 percent to
5.3 percent during 1989. The two busiest intersections in the City, Dublin
Boulevard at San Ramon Road and Dublin Boulevard at Dougherty Road, showed a
slower growth rate than the previous year. This may be a result of freeway and road
improvements in surrounding areas.
Volume to Capacity Ratios (V/C) were calculated for each of the 5 intersections to
determine Levels of Service (LOS). A Summary of these calculations is shown in
Table 2. This table shows a comparison of the VIC and LOS for 1988 with our 1989
4637 Chabot Drive, Suite 214, Pleasanton, California 94588 . (415) 463-0611
PLEASANTON·SACRAMENTO·FRESNO·CONCORD
Mr. Lee Thompson
-2-
April 4, 1990
calculations. There has been little change in the V/C and the related LOS at all
intersections except at Dublin Boulevard and Dougherty Road. The improvement
from LOS D to LOS C is in part a result of an increase in the base capacities used in
our calculations. The base capacities used in our 1990 calculations reflect more
closely the actual signal phasing. In the 1989 calculations, the fact that most
eastbound right turning vehicles and northbound left turning vehicles flow
concurrently was not accurately reflected. Therefore, the 1989 results are
unrealisticly high.
sam
Enclosure
157-001.3
CITY OF DUBLIN
DOWNTOWN TRAFFIC MONITORING PROGRAM
TABLE 1
TOTAL ENTERING TRAFFIC AND X CHANGE
AVERAGE
1987 1988 1989 X INCRS
INTERSECTION
VOL % INCRS VOL % INCRS VOL
San Ramon Rd & Amador Valley Bl nc nc 3,692 5.3 3,889 2.65
San Ramon Rd & Dublin Bl 5,643 4.3 5,884 5,945 2.65
Dublin Bl & Regional St 3,094 5.7 3,271 .4 3,285 3.05
Dublin Bl & Village Parkway 3,023 4.1 3,148 23.2 3,879 13.65
Dublin 81 & Dougherty Rd 3,528 9.2 3,853 5.2 4,054 7.2
(Volume figures refer to peak hour volumes)
TABLE 2
VOLUME TO CAPACITY RATIOS (V/C) AND LEVELS OF SERVICE (LOS)
1988 1989
V/C LOS V/C LOS
INTERSECTION
San Ramon Rd & !Iador Valley Bl .73 C .71 C
San Ramon Rd & Dublin Bl .94 E .96 E
Dublin Bl & Regional St .72 C .75 C
Dublin Bl & Village Parkway .82 D .82 D
Dublin Bl & Dougherty Rd .9 D .8 C
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