HomeMy WebLinkAboutStaff Report 4.A 10/21/2013 ITtP:wv-#4. 1
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DATE`. October 21, 2013
TO: Honorable/Mayor and Members of the City Council through City Manager
FROM: Dan St. John,'F.ASCE—Director, Public Works and Utilities
Curt Bates, P.E.— City Engineer
SUBJECT: Progress Report on.Traffic"Study Addressingfetaluma Boulevard South Road
Diet Project
RECOMMENDATION
This is"a.progress report addressing,the traffic operations and,safety ofitherecently completed
road diet project.on Petaluma Boulevard South, between Washington Street and D Street.
BACKGROUND
Perthe City Council's request, the Traffic Engineering Division is•in the process of performing a
post project`traffic study of:the:Petaluma Boulevard South Road Diet. The project, located
`/ between Washington Street and D Street, consisted primarily of reducing through travel lanes
from two in each,direction to'one;in each direction, addingturn.lanes at each intersection and
restriping lane lines.and'parking=stalls to meet current-standards. Construction on the project was
completed on June 17, 2013:
DISCUSSION
City staff has been monitoring traffic operations through the subject road diet project since its
completion. The monitoring consists of visual observations, traffic volumes, speeds,time runs.
and collision.data During the first few weeks after the road diet was complete, City staff
observedvehicles`stopping in and.blocking the:intersection:of Petaluma Boulevard Soutfi';and
Washington Street:, Staff believes the primary reason for this'is:drivers becoming'accustomed to.
the new,lane configurations on the Boulevard. Specifically; the'reduction cif(one'travel lane in
each direction reduced.the,storage space for vehicles to queue while a-vehicle is parallel parking
or pedestrians are using the lighted crosswalk near Putnam Plaza.. Recent observations on this
have demonstrated that most drivers are now more aware of the,new configuration and
accustomed to the road diet alignment. Tht amount of vehicles blocking the intersection has
been reduced.
Staff has monitored, logged, and responded to compiaints,regarding.the road diet project; and has
met with representatives ofithePetaluma Downtown Association and local businesses to solicit
Agenda Review:
City Attorney finance Director City Manager
feedback,orithe road diet;operations. Several complaints were received'about the new signal
timing at two locations, Washington Street and.the Boulevard and at:B:Street and the Boulevard.
Adjustmentsrwere made'to'the signal timing,at both locations that have improved traffic
operations at both intersections. The,traffic signals at Washington Street/PBS and D Street/PBS
are in coordinated timing during the morning, mid-day and evening peak commute hours. The
signalsrat Western and B Street are not currently in coordination timing. Staff is currently
analyzing whether placing these intersections in coordinated timing will improve traffic
operations.
Staff monitors vehicle collision;history in the road diet area. There were 90 reported pre-project
collisions between January 1, 2006 and July 30, 2009. Collision data was used from this time
period because the City first applied for the Road Diet grant in 2009. There have been 6 reported
collisions between June 17, 2013 and August 28, 2013, and none since then. Although the post-
project sample size is small,the trend is encouraging and suggests a reduction in reported
collisions from 2.1 per month to 1:7 per month. City staff will continue to monitor collisions in
the road diet area with the experience::since August, staff is optimistic that the will result
in a significant treduction in vehicle collisions through the long run.
During the time period of September-17t through October 2"d, staff set monitoring equipment to
collect vehicle volumes and speeds-on the Boulevard near Putnam Plaza, Center Park and
between B and C Streets. The;results showed an average daily traffic of approximately 11,023 to
1 1,923 vehicles per day. The pre-project levels were measured at approximately 10,590 to
11,170 vehicles per day. City staff also measured post road diet traffic volumes at 14,948
vehicles per day on Petaluma-Boulevard North, between Washington Street and Lakeville Street.
In October:2009, traffic volumes,measured at 15,374 vehicles per day on the Boulevard between
Washington and Lakeville Street. Vehicles speeds were measured on'the Boulevard at,an
average of 21 MPH'b'etween`W,ashington-Street and B Street and 26 MPI-I between B Street and
D Street. The:results indicate that traffic volumes and average speeds are consistent with
conditions observed prior to-road diet construction:
Several complaints.were•received that travel times through the new road diet increased to
upwards of 15 minutes. Therefore, staff performed 25 time runs on Petaluma Boulevard between
Oak Street and E Streetto anal`ze post project conditions. The runs'were performed between
September 26th and October 3`�inmorning, midday and mid-afternoon hours. The results
indicated a minimum of 2 minutes, 36 seconds;a maximum of 6 minutes, 18'seconds: and an
average'of3:rninutes 47 seconds to travel that distance. The longer'runs occurred during-the end
of the lunch hour period and between 3:00 pm and 3:30 pm-after school is out Approximately
2/3 of the runs took between 3 and 4 minutes. Staff did not perform travel time test before the
project was builtand therefore does nothave data to compare.
Traffic engineering staff is also currently working with the project traffic engineering firm, GHD
Inc., to evaluate the,post;project level of service ateach of the four signalized intersections
affected by the roads-diet. That analysis is expected to be completed in November 2013 and will
be used to inform plans.to improve timing and synchronization between signals. Staff is also
evaluating pavement markings and signage to be sure drivers know they can pass cars in the
process of-parallel parking as long as the center lane-is free.
Staff will summarize the results of the on-going evaluation oftheisignalizedintersections and of
the pavemenfmarkings and signage and provide a report io.the CiiyCouncil in February2014.
FINANCIAL IMPACTS
Staff has committed-$7,240 for the traffic engineering consultant to complete the traffic signal
study. There is sufficient funding-remaining in the City's CIP project budget'to,accommodate
these costs. City staff time is covered through existing staff allocations.
ATTACHMENTS
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