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SAVANTS GROUP
Denton Tap Road/S Belt Line Rd Traffic Signal Timing
Coppell, Texas
Savant Group Inc. (SGI) is looking forward to the opportunity to work with the City of
Coppell to develop and implement traffic signal timing at 12 intersections along Denton
Tap Road/S Belt Line Road. The following details our proposal for the project and
identifies the fee associated with the work.
A. Scope of Services
We understand we will be developing new coordinated signal timing plans for 12
intersections along Denton Tap Road/S Belt Line Road. Those intersections include:
o Denton Tap Road at Natches Trace;
o Denton Tap Road at Parkway Boulevard;
o Denton Tap Road at Town Center Drive;
o Denton Tap Road at Sandy Lake Road;
o Denton Tap Road at Bethel School Road;
o Denton Tap Road at Bethel Road;
o Denton Tap Road at E Belt Line Road/Southwestern Boulevard;
o S Belt Line Road at Airline Drive;
o S Belt Line Road at Wrangler Drive;
o S Belt Line Road at Lakeshore Drive;
o S Belt Line Road at Saintsbury (future location); and
o S Belt Line Road at Dividend Drive.
We anticipate the need to develop timing plans for AM peak, PM peak, and off peak
times. Additional timing plans may be identified after 24 hour counts are collected. This
scope is based on developing and implementing three timing plans. If additional timing
plans are needed, we will identify those times and discuss a scope adjustment with the
City. Travel time runs will also be collected at the onset of the project. This information
will be used initially to calibrate the models and later for a measure of improvement for
the new timing plans.
Task 1.0 — Project Management and Coordination
This task will cover all efforts necessary to maintain the project schedule and progress
of timing plan development. It will include items such as project meetings, coordination
with data collection firms, invoicing, etc. We anticipate three meetings total for this
project. The first meeting will be a kick-off meeting for the project that will include
receiving from City staff copies of existing timing plans and intersection layouts. The
meeting will be an opportunity to discuss any additional specific details of the project not
detailed in the scope as well as to get any operational insight from City staff.
The second project meeting is anticipated after the timing plans have been generated
and a preliminary report is submitted to the city. The final meeting will take place after
the consultant has submitted a draft final report to the city to discuss the final results
and receive comments from City staff needed to complete the final report.
Task 2.0 — Data Collection
SGI engineers will coordinate data collection efforts with an independent data collection
firm. Twenty-four hour counts will be collected for two consecutive typical weekdays at
two locations along the corridor including percent of heavy vehicles. The 24-hour
counts will be evaluated to identify peak travel times during the day that turning
movement counts are needed. Peak hour turning movement counts including
pedestrian volumes will be collected for three peak periods, two hours during each
peak, at each of the signalized intersections included in this project, excluding Belt Line
at Saintsbury. Before and after travel time runs will also be collected along the corridor
to provide a measure of the new timing plan improvements.
SGI engineers will collect all existing signal timing plans for the corridor from City staff
and any existing signal plan layout sheets available. SGI engineers will conduct a
detailed field review of the corridor collecting data along the corridor and at each
intersection, identifying signal phasing, pedestrian treatments, number of lanes, lane
assignments, speed limits, detection, and other operational impacts that will affect traffic
operations along the corridor.
Task 3.0 —Timing Plan Development
The data gathered in Task 2.0 will be used to perform a capacity and level of service
analysis of each intersection using SynchroTM software. The existing timing plans will
be utilized to develop a base Synchro model to determine the existing level of service
for each intersection along the corridor.
The engineers will conduct a cycle length analysis to determine the most effective cycle
length along the corridor. Individual intersections will then be analyzed to develop
optimum split times to most efficiently use the green time to minimize delay and
maximize throughput on priority movements as identified by City Staff. When split times
have been identified, offsets will be calculated to encourage progression along the
corridor. We understand the importance of the intersection of Parkway Blvd at Denton
Tap Road, specifically regarding traffic backups during the am peak related to high
school traffic. Additionally, we understand there are concerns with backups at Bethel
School Road and Sandy Lake Road.
SGI engineers will prepare a preliminary report that will provide details on existing
operational details of the project corridor and the proposed timing plans and schedule of
SAVANT GROUP Page 2of4
operation to be implemented. The report will include tables that summarize the
proposed timing plans and time-space diagrams for each of the timing plans developed.
All count data and HCM summary sheets will be included in the appendices of the
report. After the City has reviewed the report, SGI engineers will meet with City staff to
discuss any concerns or issues. SGI engineers will address any issues raised and
provide a revised preliminary report to the City. The timing plans in the preliminary
report will then be deployed in the field. SGI engineers will install the timing plans in the
controllers in cooperation with City signal technicians to enhance technician
understanding of equipment and signal timing methodology.
Task 4.0 — In-field Fine Tuning
SGI engineers will conduct fine-tuning along the corridor. Fine-tuning will be conducted
by experienced engineers and will include all new timing plans. This effort will make
final adjustments to ensure the most efficient operation possible along the corridor. SGI
engineers will make field adjustments in cooperation with City of Coppell staff to further
aid staff in understand of timing plans. When fine-tuning is completed, travel time runs
along the corridor will again be conducted.
Task 5.0 — Final Report
SGI engineers will prepare a final report that will build on the preliminary report and
include the final, fine-tuned timing plans. The final report will also include summary
discussion and tables showing improvements in travel time and reductions in delay as a
result of the project. The final report will be submitted to the City for review. After a
review meeting, SGI engineers will incorporate comments from the City and provide a
final report on the tasks of the project and the final results realized.
Schedule
Traffic volume counts will be scheduled upon receiving a Notice to Proceed. Traffic
counts will not be collected on any days that the Coppell Independent School District is
not in session. We anticipate receipt of existing traffic signal timing for all project
intersections from City Staff within 10 business days of issue of Notice to Proceed. We
understand the necessity to complete the signal timing updates in a timely manner and
have new timing plans in place and fine-tuning completed by mid-May. This timeline
can be met as long as the Notice to Proceed is received no later than March 15, 2013.
Fee
Denton Tap Signal Timing $48,385.00
It is expected that invoices will be paid upon receipt; interest at the rate of 1.5% per
month will accrue after 30 days of issuance unless prior arrangements are made. The
fees stated above are applicable to this project and study only for a period of no more
S AVAN To G ROUE) Page 3 of 4
than 30 days. The fees are subject to change if the proposal is not accepted during this
period.
If you agree with the terms of this proposal, please sign in the space provided and
return the signed copy to our office. After we receive a signed copy of the scope of
work, we will commence work on this project. Please return the signed document via
fax to our Dallas office at 214.468.8266 and keep a copy for your file. If you have any
questions, please feel free to contact me at 214.468.8200.
Thank you for the opportunity to present this proposal. We look forward to working with
you on this project.
Sincerely,
7i,
Susan Langdon, P.E., PTOE
President
AGREED TO AND ACCEPTED BY:
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Denton Tap Road Scope v1.0.doc
SAVANT ( GROUP Page 4of4