HomeMy WebLinkAbout7.2 AnnualTrffcSftyRprt
CITY OF DUBLIN
AGENDA STATEMENT
City Council Meeting Date: April 11, 1988
SUBJECT:
Annual Traffic Safety Report: Accident Location
Analysis and Downtown Traffic Monitoring
EXHIBITS ATTACHED:
1) 1987 Traffic Accident Map (will be displayed at
meeting)
2) Report from TJKM - High Accident Location Analysis
3) 1988 Traffic Volume Map
4) Report from TJKM - Downtown Traffic Monitoring
~
Receive presentation by TJKM and direct Staff to
include recommended safety improvements in Capital
Improvement budget.
RECOMMENDATION:
FINANCIAL STATEMENT:
This study itself will not have direct cost
implications. Recommendations for improvements based
on high accident locations will be cost-estimated and
included in the Capital Improvement budget.
DESCRIPTION:
This report includes reports on two studies by TJKM:
I. Accident Locations
At the meeting of March 23, 1987, in making a 6-month review of the stop
signs on Donohue Drive, the City Council directed Staff to perform an annual
review of intersections with a high incidence of accidents.
The traffic accident map for 1987 indicates 257 accidents, broken down
into 197 with property damage only, 58 involving injury, and 2 fatal
accidents.
This compares to previous years' statistics as follows:
1987 1986 1985
1) Property damage 197 224 204
2) Injury 58 80 65
3) Fatal 2 1 0
257 305 269
The locations having the highest number of accidents were identified by
determining the intersections having at least five accidents in each of the
last three years. Five locations were identified. During TJKM's review, one
location showed an unusually high number of accidents when compared to
previous years and was also included for analysis. The other intersections
only averaged one to two accidents per year and these accidents seemed to be
random. The locations and number of accidents are listed and reviewed as
follows:
Intersection
Accidents Per Year
1987 1986 1985
Dublin Blvd. & San Ramon Rd.
Dublin Blvd. & Regional St.
Dublin Blvd. & Dougherty Rd.
San Ramon Rd. & Amador Valley Blvd.
Amador Valley Blvd. & Dougherty Rd.
Dougherty Rd. & Monterey Dr.
18
7
7
6
6
8
20
10
8
8
5
2
11
12
12
6
6
1
- - - - - - - -- - - - - - - - - - - - - -- - - - - - - - --- - -- - - - - - - - - - - - -- --- -- -- - - - -- - -- - - -- - -- - -- --
ITEM NO. r:. p..
COPIES TO:
Except for the intersection of Dougherty Road and Monterey Drive, there
have been five or more accidents per year at each of the highest accident
locations. At most of these locations, some improvements have been
constructed during 1987. There are pending-improvements at some of the
others. The primary purpose of these improvements is to provide more
capacity, with a secondary benefit of accident reduction. The 1988 review of
these locations may reveal further reductions in number of accidents.
TJKM's report includes a description of the types of accidents occurring
at each of these intersections and current or future mitigation measures which
are summarized as follows:
Dublin Blvd. and San Ramon Road
Accidents have increased at this intersection in 1986 and 1987 over
1985. This increase may be attributable to higher traffic volumes. The
biggest percentage of the total was the rear-end type, which is typical of
signalized intersections. Prevention of this type of accident is difficult in
through lanes but may be mitigated in turning lanes. The northbound dual
right turn lane on San Ramon Road is one such mitigation. A right-arrow
signal has been installed to control this movement. Five rear-end accidents
have occurred in the free right turn lane on Dublin Blvd., eastbound to
southbound. A likely cause is indecision on the part of drivers as to when
they may safely enter the traffic stream. New construction at the Shell
Station will eliminate the triangular island and place this lane under the
control of the signal.
Dublin Blvd. and Regional Street
Accidents have decreased slightly at this intersection over the last
three years. I The majority of the accidents have been rear-enders in the
westbound lanes between 12:00 noon and 6:00 p.m., during heavy congestion.
The congestion is due in part to the demand for left turns at San Ramon Road
and the maneuvering necessary to enter the left turn lanes. Dublin Boulevard
is scheduled to be restriped to have three westbound lanes at Regional Street
instead of two, which will allow traffic turning left at San Ramon Road to use
two lanes at Regional Street instead of just one. An overhead sign will
direct traffic into the proper westbound lanes. This improvement is scheduled
to be done within the next month or two.
Dublin Blvd. and Dougherty Road
Of the seven accidents occurring during 1987, five were rear-enders.
Improvements have been completed at this intersection, including restriping,
markers, and changes in signal indications in order to better guide traffic in
the dual left turn lanes. No accidents occurred during the month of December,
1987, which may indicate that the improvements are helping reduce accidents.
San Ramon Road and Amador Valley Blvd.
This intersection was part of the San Ramon Road Phase II project
completed in 1987. The seven accidents occurring in 1987 were a significant
reduction from the ten or twelve in previous years. This may be directly
attributable to improvements now in place, which included addition of a
through lane and an improved left-turn storage lane.
Amador Valley Blvd. and Dougherty Road
Various types of accidents have occurred at this intersection, but
predominantly rear-enders on the eastbound approach (Amador Valley Boulevard),
which is controlled by a STOP sign. These accidents are generally caused by
indecision on the part of one of the drivers. No injuries occurred in any of
the accidents. This intersection will shortly be signalized as part of the
Villages development, which should eliminate a large percentage of these
accidents.
Dougherty Road at Monterey Drive
The previous accident history of this intersection indicated very few
problems; however, eight accidents occurred here during 1987. Six of these
were rear-enders (five involving more than one vehicle) and two were side-
-2-
swipes. All collisions were at a two-lane portion of Dougherty Road, with the
vehicles traveling northbound. The cause of these accidents is the lack of a
storage lane for vehicles turning left into Arroyo Vista. The widening of
this portion of Dougherty Road, including addition of left turn pockets, will
be done by the developer of the Villages project and is tentatively scheduled
for the summer of 1988.
II. Downtown Traffic Monitoring
The Dublin Downtown Specific Plan, adopted in July of 1987, contained
several strategies in its implementation plan. The circulation strategies
included a traffic monitoring program, which recommended that traffic counts
be conducted periodically at key locations and intersections.
Daily traffic volumes is a key indication of traffic activity on City
streets. The traffic flow map, last prepared in 1984, has been updated for
1988 and is attached to this report. Traffic has increased on major streets
in most parts of the City, most notably on Dougherty Road and San Ramon Road
which showed increases of 25% to 40% depending on location. Other streets,
such as Silvergate Drive, Stagecoach Road, and Amador Valley Boulevard near
Stagecoach, showed increases of 5% to 15%, primarily due to new development.
The new signal interconnect system will permit TJKM to determine 24-hour
traffic counts at three locations on Dublin Boulevard; this will be done on a
monthly basis.
Level of service analyses were performed on eleven downtown
intersections. Four of these have a levels of service lower than A:
Ramon Road and Amador Valley Blvd., San Ramon Road and Dublin Blvd.,
Blvd. and Regional Street, and Dublin Blvd. and Village Parkway.
San
Dublin
Three of these four intersections have been re-counted within the past
year. All experienced traffic growth; however, the two San Ramon Road
intersections also had substantial capacity increases. The two Dublin Blvd.
intersections have capacity increases proposed for the coming year.
Peak hour traffic volume has increased 45% over the last four years at
the San Ramon Road/Dublin Blvd. intersection, with most of the increase coming
between 1986 and 1987. Conditions at this intersection remain at LOS "E",
despite the major increases in capacity created by the recent improvement
proj ect.
During the same time period, the Dougherty Road/Dublin Boulevard
intersection experienced a slight decline in traffic volume, which is
attributed to construction at the 1-580/Dougherty interchange. It is possible
that some of the traffic from Dougherty Road has been diverted to San Ramon
Road. New counts will be taken after the construction is completed.
This review indicates the importance of conducting at least a limited
annual review of traffic conditions as an aid to short and long-term planning
for the downtown area. It is recommended that annual intersection counts be
taken at the four downtown intersections, plus Dublin/Dougherty and San Ramon
Road/Alcosta Blvd., the key gateway locations for the City of Dublin.
-3-
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R E eEl .- E D
APR 5 1988
.637 Chabot Drive, Suite 214
Pleasanton Ca. U566
(.15) .63-0611
PUBUC WORKS
MEMORANDUM
DATE:
April 5, 1988
TO:
Lee Thompson, City Engineer
FROM:
Ty Tekawa
SUBJECT:
High Accident Location Analysis
TJKM has completed its analysis of high accident locations based on the City's
accident spot maps and records. A review of the last three years revealed the
following general statistics:
Total Accidents
Number of Accidents
1985 1986 1987
204 224 197
65 80 58
J -I. --1
269 305 257
TVDe of Accident
Property Damage Only
Injury
Fatal
The locations having the highest incidence of accidents were identified by
determining the intersections or street segments that had 'at least five accidents in
each of the last three years. There were five locations identified. During our
review, one location showed an usually high number of accidents when compared
to previous years. This location was also included for analysis.
The locations and number of accidents per year are shown on the following list:
Accidents Per Year
Intersection 1985 1986 1987
1. Dublin Boulevard & San Ramon Road 11 20 18
2. Dublin Boulevard & Regional Street 12 10 7
3. Dublin Boulevard & Dougherty Road 12 8 7
4. San Ramon Road & Amador Vallcy Blvd. 6 8 6
5. Amador Valley Blvd. & Dougherty Rd. 6 5 6
6. Dougherty Road & Monterey Dr. 1 2 8
Except for the intersection of Dougherty Road and Monterey Drive, there have
been more than five accidents per year at each of the high accident locations. At
most of these locations, some improvements have been constructed during 1987.
There are pending improvements a t some of the others. The primary purpose of
these improvements is to provide more capacity. A secondary benefit of these
improvements should be the reduction of accidents. The 1988 review of these
locations may reveal a further reduction in accidents.
PLEASANTON'SACRAMENTO'FRESNO'CONCORD
· .
Mr. Lee Thompson
-2-
April 5, 1988
Collision diagrams for each of the high accident locations was prepared, and are
attached with this memo. The diagrams show the type of accident, severity, time
of day and lighting conditions. They are useful in revealing any patterns of
collisions and whether there are any practical mitigation measures which could be
implemented.
Following is a description of each of the intersections with comments and
recommendations:
1. Dublin Boulevard and San Ramon Road
This intersection experiences the highest volumes of traffic in the City. Traffic
congestion is a continuing problem and mitigating improvements have been
constructed. Further proposals for changes in lane assignments are being prepared.
In 1985 there were II accidents reported at this intersection. During 1986 and
1987 the accidents increased to 20 and 18 respectively. During the same two years,
widening of San Ramon Road was constructed and traffic signal modifications
were implemented. Of the 18 accidents in 1987, 7 occurred in December. A cause
may have been increased traffic during the holiday season. Thirteen of the
accidents were rear-end types. This type of accident is typical at signalized
intersections., Prevention of this type of accident is difficult in through lanes;
However, when rear-enders occur at turning lanes, they may be mitigated. One
mitigation measure has been implemented at the northbound dual right-turn lane
on San Ramon Road. A right arrow signal indication has been installed to control
this movement. The eastbound to southbound right turn has been a free right turn.
Five rear-end accidents have occurred in this area. A likely cause is the indecision
of drivers while entering the southbound traffic stream. Construction of a new
curb return and elimination of the triangular island at this location should
decrease this problem. The right turn traffic in this direction will be under
traffic signal control. Next year's evaluation of this intersection should show a
decrease in this type of accident.
2. Dublin Boulevard and Regional Street
In the three year period from 1985 through 1987, there have been 30 accidents,
1 I in 1985, 10, in 1986 and nine in 1987. Most of the accidents have been rear-
enders in the westbound direction during the afternoon hours between 12 noon and
6:00 p.m. These hours are periods of heavy congestion.
The congestion is due in part to the heavy demand for left turns at the San Ramon
Road/Dublin Boulevard intersection, and to the resulting weaving and
maneuvering required to enter the left-turn lanes. Currently, all traffic desiring to
turn left at San Ramon Road must enter the median side through lane at the
westbound approach of Regional Street, or attempt to merge into this lane on the
farside of the intersection of Dublin Boulevard at Regional Street. This congestion
will ease when, in the near future, Dublin Boulevard is re-striped to have three
westbound lanes at Regional Street, rather than the existing two lanes. This
improvement would allow left-turning traffic at San Ramon Road to queue in two
lanes a t Regional Street rather than just one. An overhead sign is on order to
direct traffic into the proper westbound lane for turns onto San Ramon Road.
"
Mr. Lee Thompson
-3-
April 5, 1988
3. Dublin Boulevard and Doughertv Road
Of the seven accidents that occurred in 1987, five were rear-enders, two were
side-swipes, one a right-angle and one involved a left turning vehicle.
Dougherty Road was undergoing some construction during 1987. The pavement has
now been re-striped, the signal indications have been improved and guide markers
ha ve been placed to guide traffic in the dual left-turn lanes. There were no
accidents reported in December of 1987. This may be an indication that some of
the improvements are helping to reduce accidents. 1988 may show more reduction
in collisions. It should be noted that of the 29 accidents at this intersection, only
three resulted in injuries.
4. San Ramon Road and Amador Vallev Boulevard
This intersection was included in the San Ramon Road improvement project
completed in 1987. There were seven accidents reported in 1987, showing a
reduction from twelve and ten the previous two years. There were two rear-end
accidents, two side-swipes involving turning vehicles, one single vehicle accident
hi tting a fixed object and one right-angle type. In the prior two years, the
predominant accident type was rear-enders, along with accidents involving
northbound lc::ft-turners and southbound through vehicles. The reduction in this
type of accident may be directly related to the improvements now in place. The
improvements included the addition of a through lane and an improved left-turn
storage lane along with improved signal indications. A review of this intersection
next year should verify the benefits of these improvements.
5. Amador VaIJev Boulevard and Doughertv Road
There have been seven teen accidents at this intersection in the last three years: six
in 1985, five in 1986 and six in 1987. Eight of these seventeen accidents were
rear-end accidents at the eastbound approach, seven during daylight hours and one
during darkness. Eight accidents occurred on Dougherty Road, and varied from
side-swipes to rear-enders to left turn accidents to single car accidents (hit fixed
object). None of the accidents resulted in injuries.
This "Tn intersection is presently un signalized with a STOP sign controlling
eastbound Amador Valley Boulevard. Most of the rear-enders occurred because of
poor judgement on the part of one of the drivers. Because of indecision while
driving into Doughcrty Road, thc first car at the intersection is rear-ended by the
inattentive driver following. This problem may be improved by the installation of
traffic signals. The signals are proposed for installation and plans have been
prepared. Construction should be completed as a part of Dougherty Road
improvements south of Amador Valley Boulevard.
6. Doughertv Road and Monterev Road
Although the accident history at this intersection in previous years showed very
little problems, the 1987 map showed eight accidents. Six of the accidents were
rear-enders, two were side-swipes. These accidents resulted in five injuries and all
but one of the accidents occurrcd in daylight hours. Five of the rear-end accidents
involved more than two vehicles.
Thesc collisions were at a two-lane section of Dougherty Road. All involved
northbound vehicles on Dougherty Road.
Mr. Lee Thompson
-4-
April 5, 1988
The cause of these accidents is a lack of a storage lane for left turn vehicles.
Improvements are now bcing approved for this section of Dougherty Road. With
the installation of a lcft-turn lane into Monterey Drive there should be a
significant reduction in accidents at this intersection.
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Attachments
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DATE COMPILED~-29-88
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-ICIIVED
APR 4 1988
PUBLIC WORIfC:
- -,;mwORANDUM
.637 Chabot Drive, Suite 214
Pleasanton Ca. 9.566
W5) .63-0611
DATE:
April 4, 1988
TO:
Lee Thompson
FROM:
Chris Kinzel
SUBJECT:
Downtown Traffic Monitoring
The Dublin Downtown Specific Plan, adopted by the City in July of 1987,
con tained several strategies in its implemen ta tion plan. The circulation strategies
included a traffic monitoring program, which recommended that traffic counts be
conducted periodically at key locations and intersections. This memo includes
information on the downtown monitoring program.
Daily traffic volumes is a key indication of traffic activity on City streets. In
July of 1984, a Citywide Traffic Flow Map was prepared for use by City officials
and staff members and the general public. That map has been updated for 1988
and is attachéd. Not unexpectedly, traffic has increased on major streets in most
parts of the City. The increases are greatest on Dougherty Road and on
San Ramon Road, varying from some 25 percent to over 40 percent in various
areas on the two streets. Other streets have traffic increases ranging from 5 to
15 percent. Greater increases occur where specific development has occurred, such
as on Silvergate Drive and on Amador Valley Boulevard near Stagecoach Road.
With the new Dublin Boulevard Traffic Signal interconnect system, there are
capabilities to determine 24-hour counts at three locations on Dublin Boulevard
using the computer system. We will plan to do this on a monthly basis to track
both growth and seasonal variations in counts.
Another effective way of monitoring traffic conditions is through the use of
intersection level of service analyses. In the Downtown plan, eleven intersections
were analyzed. Only four of these had levels of service lower than A: San Ramon
Road and Amador Valley Boulevard, San Ramon Road and Dublin Boulevard,
Dublin Boulevard and Regional Street and Dublin Boulevard and Village Parkway.
These are the most likely candidates for on-going annual monitoring.
Three of these four intersections have been recounted within the past year. All
experienced traffic growth. However, the two San Ramon Road intersections also
had substantial capacity increases while the two remaining Dublin Boulevard
in tersections have capacity increases proposed for the coming year.
Peak hour traffic volumes at the Dublin Boulevard/San Ramon Road intersection
have increased substantially in the past four years:
PLEASANTON'SACRAMENTO'FRESNO'CONCORD
Mr. Lee Thompson
-2-
April 4, 1988
Year
Dublin Boulevard/San Ramon Road
Total Entering Traffic
P.M. Peak Hour
Percen t
Change
1984
1985
1986
1987
5,120
5,555
5,984
7,463
+8.5
+7.7
+24.7
As a result, even with major increases in capacity created by the recent
improvement project conditions have remained at Level of Service E, with only a
slight improvement for 99 percent of capacity utilization to 96 percent utilization.
However, during this same time period, construction activity on or near Dougherty
and 1-580 and reduced the growth of traffic in the peak hour:
Year
Dublin Boulevard/Doughertv Road
Total Entering Traffic
P.M. Peak Hour
Percent
Change
1984
1985
1986
1987
3,587
3,745
3,640
3,528
+4.4
-2.8
-3.1
It appears that construction-produced congestion at Dougherty Road/I-580 may be
causing some traffic to divert to San Ramon Road. New counts this fall, after
completion of the freeway in terchange, should determine the accuracy of this
assumption.
This review has shown the importance of conducting at least a limited annual
review of traffic conditions as an aid to short and long-term planning in and near
the downtown area. It is recommended that annual intersection counts be
conducted at the four downtown intersections plus Dublin Boulevard/Dougherty
and San Ramon Road/ AI costa Boulevard. These locations represent the key
gateway locations for the downtown and for the City as a whole.
nlc
157-001