TR9701-CS 961001From: TONY TRAMEL To: Atul P=,tel
TONYTRAM
Dale: 10/2/96 Time: 08:41:01
Page Iol 17
Parsons 17' ? ~ ~,,. ?~. ~i-.., ?freet
Brinckerhoff Suite ~ '/ 0
Dallas, TX 75202
214-747-6336
Fax: 214-74¢-1937
FAX
to Atul Patel E.I.T.
fax no. 972-304-3673
comments Pleas review the attached ASAP. I believe that we have taken care of your review comments you
provided. You will note my comments and the disposition of your comments on the attached material. I am
also sending you a complete copy of the scope again with the changes made in this October 1, 1996 version.
An original of this fax will follow via regular mail for your records.
It is hoped that you can recommend to Ken that you are in concurrence with this scope at this time. If this is the
case please have Ken sign the concurrence form and send back to us via FAX at 214-741-1937, ( I hope that you
have the FAX number problem solved by now!), as soon as possible. We must have this concurrence letter
tomorrow to meet our scheduled Commissioner's Court meeting.
If you have any problems with transmission end/or did not receive all of the pages, please carl (214) 747-6336.
Over a Century of.
Engineering ExcellenCe
D:\GEN ERALV204COR R\(24-10UT\COPPELL\I996~O8.DOC
From: TONY TRAMEL To: Alul Patel Date: 10/2/96 Time: 08:41:01 Page 2 of 17
October 1, 1996
Mr. Atul Patel, E.I.T
City of Coppell
255 Parkway Blvd.
Coppell, Texas 75019
Subject:
Disposition of Design Review Comments For Scope Of Services
Request For Concurrence of Proposed Services for 8 Signal Improvements
Dear Mr. Patel:
Attached is the revised Proposed Scope of Services, dated October 1, 1996, for CMAQ Project 75
signal timing improvements for the 8 intersections located in the City of Coppell, Texas. This
revised scope considered your review comments of our September 18, 1996 correspondence.
Your review comments are attached along with their deposition for reference.
Please review the Design Review Comment Form and the revised Proposed Services and provide
any additional comments directly on the attached forms. It is hoped that we have resolved your
previous comments to your satisfaction. If you concur with the revised Proposed Services, please
note by your signature in the place provided on the Concurrence Form. Otherwise, provide your
review comments to the CMAQ office for disposition.
Upon receipt of your concurrence forms and approval of the TIP Amendment by NCTCOG, the
Proposed Services will be formally forwarded through Dallas County to TxDOT for assignment of a
CSJ number.
If you have any questions or require additional information, please contact me 747-6336 ext. 26 or
Tony Tramel at ext. 28.
Sincerely,
(ORIGINAL SIGNED)
Ivan F. Nicodemus, P.E.
Project Manager
Attachments: 1) Proposed Services - Sverdrup, Inc. w/Exhibits 2) Concurrence Form
3) Review Comment Form
cc: Allen Bud Beene, P.E. Dallas County Director of Public Works
Gary Taylor, P.E., w/o attachments Texas Department of Transportation
D:\GENERAL\G04COR R~G4-1OUT~COPPELL\1996~07. DOC
From: TONY TRAMEL To: Atul Patel
Date: 10~ Time: 08:41:01
Page 8 o! 17
ATTACHMENT 2
CONCURRENCE
(Please check one box and sign)
I have reviewed the Proposed Services dated October 1, 1996 for the traffic signal timing
improvements for Project 75.
I concur with the submitted Proposed Services contained herein, please accept this as the
City's request to forward this material through the Dallas County CMAQ Program to
TxDOT for implementation.
Mr. Kenneth Griffin, P.E.
Assistant City Manager
City of Coppell
Date Signed
I have included additional comments, on the attached review sheets, which need to be
resolved before this project is forwarded to TxDOT.
Mr. Kenneth Griffin, P.E.
Assistant City Manager
City of Coppell
After signing, please return only Attachment to:
Parsons Brinckerhoff
CMAQ Program Office
1701 N. Market Street
Suite 410
Dallas, Texas 75202
Date Signed
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From: TONY TRAMEL To: Atul Patel
Date: 10/2/96 Time: 08:41:01
Page 4 of 17
DRAFT
Dallas County Consulting Engineers Contract
ATTACHMENT A
Basic Services
TRAFFIC SIGNAL TIMING IN THE CITIES OF IRVING AND COPPELL
The Engineer shall perform the following Basic Services relative to the optimization of signal timing
for 30 intersections (34 improvements) in the Cities of Irving and Coppell. These Basic Services and
those authorized Special Services shall hereinat~er be referred to as the "Project". It is anticipated
that the Project will be subdivided into two (2) or more geographical related sections or study areas
of analysis. As a minimum, the following milestones shall be provided for each study area: 1)
completion of data collection under Special Services, 2) completion of preliminary analyses, 3)
completion of timing plan generation, and 4) completion of the Project's Final Report.
I. PROJECT MANAGEMENT AND CONTROL
The following represent tasks associated with Project Management and Control to be performed by
the Engineer:
Technical Review Progress/Meetings. Attend and present/review material at Project review
meetings held in Dallas County at a facility provided by the County or one of the participating
cities. It is agreed for budgeting purposes that up to eight (8) review meetings will be held
relative to the Project, which is expected to have a duration of approximately nine (9) months.
The Engineer shall prepare and distribute minutes of all such review meetings.
B. Project Schedule. The Engineer shall develop a projected Project Schedule in accordance with
Article 2. Project Schedule of this Contract.
Interagency Coordination. The Engineer shall maintain coordination with the County and the
participating cities for the duration of the Project. This shall include documentation of the
Engineer's meetings, telephone conversations, and correspondence with the County, and other
parties including adjoining cities, and any other agencies involved in the Project.
Project Administration and Control. It is understood and agreed that the Engineer's contract is
with the County and that all services shall be performed under the direct supervision of the
Director. It is also understood and agreed that the Cities of Irving and Coppell and/or
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Dallas County Consulting Engineers Contract
ATTACHMENT A
DRAFT
Basic Services
TxDOT's designated representative may communicate directly with the Eng/neer for the
purpose of providing technical direction relative to traffic signal timing matters which affect
their respective jurisdiction. In the event of discrepancy between the review comments of the
various reviewers and agencies, it is mutually understood and agreed that the Director will
provide final direction to the Enghneer.
II. SIGNAL TIMING OPTIMIZATION
A. Preliminary Analysis. The Engineer will perform the following preliminary analysis:
Field Observations. Prior to the development of new signal timing, the Engineer shall
conduct field observation on each route and during each time period of analysis. Such
observation shall be performed by a traffic engineer with extensive experience in the
development and implementation of progressive traffic signal timing plans.
Initial travel time runs will be made prior to the development of the new signal timing to
establish baseline conditions (speeds, delay, and number of stops) and to determine
appropriate progression speeds, areas where queue management is critical, and areas where
recurrent congestion may affect progressive traffic movement. Additional runs will be made
once the new optimized signal timing is implemented to assist in the fine-tuning and
adjustment of the new signal timings.
Verification of Intersection Geometrics. For each Project intersection, the Engineer will
verify the following elements of intersection geometrics and pedestrian accommodation that
affect signal timing:
· The number of lanes on each approach and the required or permitted usage of each lane
(i.e., "left only"; "left or straight"; "straight only"; "straight or right"; "right only"; or
"left, straight, or right", etc.);
· Approximate street widths, crosswalk lengths, and grades; and
Existence of pedestrian signal indications (i.e., "Walk" and "Don't Walk") and/or
pedestrian actuation.
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From: TONY TRAMEL To: Atul Patel Date: 10/2/96 Time: 08:41:01 Page 6 ol 17
Dallas County Consulting Engineers Contract
ATTACHMENT A
DRAFT
Basic Services
Proposed geometric improvements at each signalized intersection.
Adjust Count Data. Using factors developed from the recording machine counts, the
Engineer will estimate the vehicular volumes for those intersection approaches for which
actual Saturday turning movement counts were not made. The Engineer will present the
data collected and calculated at a Technical Review/Progress Meeting.
Determine Number of Timing Plans Required Based on an assessment of existing
recording machine count data, it is anticipated that most areas should have unique timing
plans for the AM Peak, A~ Off Peak/Noon Pe~ PM Off-Peak, PM Peak, Late Evening
Off-Peak and Saturday time periods. For each control area, the Engineer shall review the
newly collected count data to verify the number of plans.
Coordination with Adjacent Cities. Along Belt Line Road the opportunity exists to provide
some degree of coordination across Irving and Coppell at these city's mutual city limits.
The Engineer will confer with the staffs of those cities.:
The existing control areas and cycle lengths by time of day in the areas contiguous
with Irving and Coppell; and
The extent, if any, to which the other city would be willing to modify the control
areas and/or the cycle lengths to enhance the opportunities for coordination across
the mutual boundary with Irving and Coppell.
Determine Control Area Boundaries. The Engineer shall use the following process to
determine the optimum control area boundaries for six (6) unique timing plans:
Review the new and previously existing count data to determine similarities in volume
fluctuation patterns;
Review proposed signalized intersections that may be pending or scheduled for
construction in the immediate future within the studied signal systems.
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From: TONY TRAMEL To: Atul Patel Date: 1012/96 Time: 08:41:01 Page 7 of 17
Dallas County Consulting Engineers Contract
ATTACHMENT A
Basic Services
DRAFT
For each of the six (6) timing plan periods (e.g., AM Peak, AM Off-Peak/Noon, PM
Off-Peak, PM Peak, Late Evening Off-Peak, and Saturday), determine approximate
cycle length requirements for key intersections, which shall include all diamond
interchanges and all arterial/arterial intersections.
Based on the above, and taking into consideration (1) the intersections groupings
currently defined by the City of Irving or Coppell's signal systems and (2) the
opportunities for mutual coordination across city limits, the Engineer will make an
initial division of the overall Project area into control areas. This information will be
presented in map form for review and subsequent interactive discussion.
Finalize Cycle Lengths and Control Area Boundaries. The Engineer shall identify which
signals should be coordinated; determine need, time, and duration of peak period timing
plans using the following techniques:
· Conduct a variability analysis of traffic demand through the day and week; and/or
· Use of a numeric coupling index analysis using vehicle link demand to distance
ratios, and/or
· Use of computer software coordinability factors, grouping of natural isolated
location cycle lengths; and/or other
· Methodologies utilized in this analysis however such methods must be acceptable
to the City jurisdictions. Coordination recommendations shall identify locations
which are to perform as a coordinated system by time-of-day. Each timing plan
shall include start and duration time and shall include the peak traffic demand
periods.
Technical Memoranda. For each control area, the Engineer shall prepare a Technical
Memorandum which documents the following:
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DRAFT
Dallas County Consulting Engineers Contract
ATTACHMENT A
Basic Services
Proposed control area boundaries, with discussion of factors which went into their
determination (e.g., cycle length requirements, volume fluctuation patterns,
coupling indices, etc.);
Proposed coordination, if any, across city limits;
· Proposed cycle lengths; and
Preliminary measures of effectiveness.
In addition, the following information will be provided as an appendix to the technical
memorandum:
· Traffic counts, both raw data and adjusted values;
· Initial travel time data.
The Engineer will meet with the County and representatives of the local jurisdictions to
receive comments on each such technical .memorandum during the scheduled Technical
Review/Progress Meetings (paragraph I. A.). The technical memorandum shall be
formatted to facilitate its incorporation into the Project's Final Report. Changes which are
agreed to at the Technical Review/progress meetings will be documented in the minutes of
the review meeting and will be incorporated into the Final Report in accordance with the
following Article III. Deliverables.
B. Generation of Timing Plans
Determine Controller Interval Timing. Based on approach speeds, trrafic volumes and
existing intersection geometrics and/or other CMAQ geometric improvement , the
Engineer will determine the appropriate controller interval timing (minimum green,
passage, yellow, all-red, walk, pedestrian clearance, MAX I, etc.). This data will be
provided in tabular (spreadsheet) format for existing geometry and for proposed CMAQ
geometry. After receipt of review comments, this data will be finalized and submitted in
tabular format in accordance with the following Article III. Deliverables.
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From: TONY TRAMEL To: Atul Patel Date: 10/2/96 Time: 08:41:01 Page 9 of 17
Dallas County Consulting Engineers Contract
ATTACHMENT A
Basic Services
DRAFT
Generate Timing Plans. Making appropriate use of PASSER II-90, PASSER III-90, or
PASSER IV-94, TRANSYT7-F, Syncro, or other County approved software, the
Engineer will generate new signal timing plans. It is anticipated that six (6) unique plans
will be generated for all subsystems of the new signal system. This will generally consist of
unique plans for the AM Peak, AM Off-Peak/Noon, PM Off-Peak, PM Peak, Off-Peak and
Saturday time periods. In addition, a "Late Evening Off-Peak" plan will be developed for
each subsystem using traffic volumes derived as follows:
Using the recording machine counts, the ratio of the Late Evening Off-Peak
volume levels to the Noon and/or PM Off-Peak volume levels will be determined;
and
The Late Evening Off-Peak turning volumes will be estimated by applying this
ratio to the counted Noon or PM Off-Peak turning volumes.
Progression band widths for all timing plans will be optimized to the maximum practical
extent through variation of the signal phase sequence (i.e., a particular left mm phase may
be "leading" during one timing plan but lagging during one or more other timing plans). At
locations where a "yellow trap" condition would result because of a lagging "protected-
permitted" left mm phase on the opposite approach, the Engineer will confer with the
Texas Department Of Transportation (TxDOT) or the local jurisdiction's staff to determine
the feasibility of their implementing "Dallas" left-turn phasing to eliminate the yellow trap.
This will include the Engineer considering vehicle driver sight distances at these locations.
The final timing willuse Dallas left-turn phasing or other means that will not allow a yellow
trap to occur.
Each timing plan will include a cycle length, offset, and split. The plans, along with a
computer-generated time-space diagram, will be submitted for review. At a subsequent
review meeting, the Engineer will discuss the characteristics of each plan and receive
comments. The Engineer will finalize each timing plan to incorporate such comments in
accordance with the following Article III. Deliverables.
A-6
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[i ii I ':'!' 7 ! l[ "!
From: TONY TRAMEL To: Atul Palel Dale: 10/2/96 Time: 08:41:01 Page 10 o! 17
Dallas County Consulting Engineers Contract
ATTACHMENT A
Basic Services
DRAFT
Finalize Timing Plans. The Engjneer will furnish the final timing plan data in generic
form, i.e., cycle length in seconds, split times in both seconds and percent of cycle, and
offset in both seconds and percent of cycle. Also included will be minimum green, amber,
all red, max phase length, walk, and dont't walk intervals. Offsets will be referenced to the
beginning of the first major street green phase (i.e., the "barrier"). The Engineer will
prepare controller time sheets for each intersection from the generic timing plans. These
will be prepared based on the individual input needs of the different controllers.
Timing data will be entered by City personnel; and it is assumed that the Engineer's role
relative to timing plan implementation will be limited to responding to questions that may
arise during the implementation process.
Timing Plan Fine-Tuning. When the new timing is operational, the Engineer will provide
qualified staff members for on-site fine-tuning assistance. During the course of this assistance,
the Engineer will observe the actual operation of the new timing plans and suggest minor
adjustments to improve the operation.
For intersections in Irving and Coppell, Irving and Coppell personnel will participate in this
process, thereby gaining familiarity with the timing plans and with the fine-tuning process. The
Engineer will provide up to three (3) person weeks of on-site fine tuning for the intersections in
Irving and Coppell.
Actual timing adjustments will be entered by City personnel.
If the final timing plans produced by the Engineer in Task II.B are not input by the City
personnel within fourty five (45) calendar days, Task II.C shall be considered complete.
Final Report. At the conclusion of the Project, the Engineer will prepare a Final Report in
accordance with the following Article III. Deliverables which will include the following:
The updated information originally provided in the technical memoranda;
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From: TONY TRAMEL To: Atul Pelel Date: 10/2./96 Time: 08:41:01 Page 11 ol 17
DRAFT
Dallas County Consulting Engineers Contract
ATTACHMENT A
Basic Services
Summary of Project benefits as determined from an analysis of the initial and fmal data
analyses; and
The following additional information, provided in the appendix:
Final signal timing data (in spreadsheet format) along with time-space diagrams; and
· Travel time runs
· Software input values used in the timing analysis for each timing plan.
III.
A.
The Engineer will submit a draft Final Report for review and will subsequently meet to review
comments during one of the Technical Review/Progress meetings. The Engineer will then
submit the Final Report, incorporating appropriate review comments in accordance with the
following Article III. Deliverables.
DELIVERABLES
Technical Memoranda, Draft and Final Report The first technical memorandum shall be
provided within a standard three ring binder with an identifying cover. The binder shall be of
sufficient size to accommodate the total number of sheets to be provided by the Engineer for
the Project Subsequent memoranda shall be printed on 8.5"x11" three hole punched paper
allowing these sheets to be inserted in the original supplied binders. The technical memoranda
shall be prepared so that they serve as sections of the Draft/Final Report. The draft and Final
Report therefore, shall consist of the provided technical memoranda with additional
supplemented text and graphics by the Engineer, including an executive summary, findings,
conclusions and recommendations. After delivery of the initial memorandum for the Project,
the Engineer shall provide a total of seven (7) three hole punched copies and three (3) non-
punched copies of each subsequent technical memorandum, Draft and Final Report. The
County will distribute the deliverables to participating cities or agencies. The Cities of Irving
and Coppell, through the County, will receive two (2) copies of the three holed punched
product, one of the unbound copies and one of the electronic copies of technical memorandum,
draft and final reports provided by the Engineer.
Electronic Files. The Engineer shall provide two (2) copies of each electronic file including the
text, spread sheets, and graphics which are published and/or presented in technical
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Dallas County Consulting Engineers Contract
DRAFT
ATTACHMENTA
Basic Services
memorandaJfmal report at the time the documents are provided to the County. The text shall be
provided both in Microsoft Word version 5.0 format and Word Perfect version 5 format,
spreadsheets shall be provided both in Lotus WK1 formats and Microsoft Excel version 4.0
formats; graphics or figures shall be provided in either MicroStation DGN format or
AutoCADD DWG format. The media for these electronic files shall be 31/2'' double-sided/high-
density diskettes with appropriate external and volume labels identifying the contents of the
diskettes.
Basic Services Fee shall not exceed:
$ 00,000.00
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From: TONY TRAMEL To: Alul Patel Date: 10~?../96 Time: 08:41:02 Page 13 of 17
Dallas County Consulting Engineers Contract
ATTACHMENT B
Scope of Special Services:
A. Traffic Volume Data Collection.
Special Services
DRAFT
The Engineer shall upon written authorization from the
County collect the following types of data at the locations identified in Exhibits A, B, and C of
this attachment.
Turning Movement Counts. New turning movement count data will be collected and
reduced for the intersections and time periods shown in the attached Exhibit A. Data will
be tabulated by 15-minute increment, by approach direction (i.e., northbound, etc.), and by
turning movement (i.e., left, straight, or right). In addition, the number of vehicles with
more than four tires will be classified by 15-minute increment and by approach.
The time periods of data collection for locations identified in Exhibit A shall be defined as
follows:
AM Peak = eight (8) consecutive 15-minute periods (normally 6:30 AM to 8:30
AM) on a non-holiday Tuesday, Wednesday, or Thursday;
1
· [Noon Peakl= eight (8) consecutive 15-minute periods (normally 11:30 AM to
1:30
PM) on a non-holiday Tuesday, Wednesday, or Thursday;
PM Off-Peak = eight (8) consecutive 15-minute periods (normally 2:00 PM to
4:00 PM) on a non-holiday Tuesday, Wednesday, or Thursday;
PM Peak = eight (8) consecutive 15-minute periods (normally 4:30 PM to 6:30
PM) on a non-holiday Tuesday, Wednesday, or Thursday; and
Saturday = any eight (8) consecutive 15-minute periods between 12:00 Noon and
5:00 PM on a non-holiday Saturday.
It is understood that the beginning and ending times of the AM Peak, Noon Peak, PM Off-
Peak, and PM Peak counts may be adjusted based on lhe results of recording machine count
data.
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Dallas County Consulting Engineers Contract
ATTACHMENT B
Special Services
DRAFT
Recording Machine Counts. For each of the locations shown in the attached Exhibit B, new
Tuesday -through Sunday recording machine count data will be collected and reduced. For
each location and direction, a minimum of ninety-eight (98) hours of data will be recorded
by 15-minute increment, beginning on or before 11:00 PM on a Tuesday and ending on or
after 1:00 AM on Sunday. Counts will not be made on holidays.
Travel Time Runs. Travel time runs will be made using floating car techniques for each of
the routes and time periods shown in the attached Exhibit C. The number of runs per
direction will be as shown in Exhibit C.
Public Meetings. The Engineer shall attend public meetings, provide technical support, and
prepare appropriate presentation material for public meetings relating to the Project when
requested by the County in writing.
Expert Witness. The Engineer shall provide technical assistance and assist the County in
litigation with third parties arising from the development or implementation of the Project when
requested by the County in writing.
Fee Schedule For Special Services
Traffic Volume Data Collection - Cities of Irving and Coppell, 30 Locations
1. Vehicle Tuming Movement Counts (Per Exhibit A)
142 Hours of 1 Person Counting ~ $00.00 Per Hour
124 Hours of 2 Person Counting ~ $00.00 Per Hour
2. Machine Counts Per 24 Hour Duration (Per Exhibit B)
17 Locations X 5 Days ~ $00 Per Day
B-2
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Dallas County Consulting Engineers Contract
ATTACHMENT B
Special Services
Travel Time Runs (Per Exhibit C)
1,008 vehicle miles ~ $0.00 Per Mile
Subtotal $ 00,000.00
DRAFT
B&C.
Public Meeting assistance and Expert Witness services to assist the County in litigation
with third parties arising from the development or implementation of the Project.
1. Provide technical support
2. Prepare exhibits
3. Deposition, research, trial time, consulting
Total Fee (rate per hour)
Principal
Project Manger
Senior Engineer
Engineer
Analyst/Sr. Technician
Technician
Clerical
$0.00/Hour*
$0.00/Hour*
$0.00/Hour*
$0.00/Hour*
$0.00/Hour*
$0.00/Hour*
$0.00/Hour*
* Not included in the not to exceed Special Services Fee amount. Not to exceed lump sum amounts
for these items shall be determined in accordance with the terms of the Contract.
Other Final Documentation. When requested by the County, the Engineer shall provide (1)
licensed copy of each traffic signal optimization software used in the development of the
timing at current prices. The costs are estimated below as follows:
Passer 11-90 ~ $0.00 per license*
Passer III-90 @ $0.00 per license
Passer IV-94 ~ $0.00 per license*
Transyt 7F ~ $0.00 per license*
Syncro ~ $0.00 per license*
Not included in the not to exceed Special Services Fee amount. Not to exceed lump sum
amounts for these items shall be determined in accordance with the terms of the Contract
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From: TONY TRAMEL To: Atul Patel Date: 10/~/96 Time: 08:41:02
Dallas County Consulting Engineers Contract
ATTACHMENT B
Special Services
Page 16 of 17
DRAFT
Total Special Services Fee shall not exceed: $ 00,000.00
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Dallas County Consulting Engineers Contract
ATTACHMENT B
Special Services
The Exhibits referenced follow lhis page:
Exhibit A - Turning Movement Locations - One (1) Page
Exhibit B - Recording Machine Count Locations - One (1) Page
Exhibit C - Travel Time Run Locations - One (1) Page
DRAFT
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