WT15022 REQUEST FOR PROPOSALS (RFP) Professional Support Services for the D4 Traffic Controller System

REQUEST FOR PROPOSALS
PROFESSIONAL SUPPORT SERVICES
FOR THE
D4 TRAFFIC CONTROLLER SYSTEM
CITY PROJECT NO. WT15022
Issued by:
City of Stockton
Public Works Department
501 W. Weber Avenue, Building 2, 3rd Floor
Stockton, CA 95202
Date Issued: September 10, 2026
Date Proposals Due: October 9, 2026; 11:55 PM
Late Submittals Will Not Be Accepted

1.0 INTRODUCTION
The City of Stockton (City) is requesting proposals from qualified firms to provide five-years
of locally funded professional service to support the City's D4 traffic signal controller software. City
Project Number WT15022.
2.0 BACKGROUND
The City operates more than 300 traffic signals and HAWK beacons, all of which run on controllers with
the D4 operating system. D4 is licensed by the City from Advanced Traffic Solutions, LLC, and
installed on Siemens/Yunex M60 and McCain EX2 controllers. The controllers are maintained by City
electricians and operated by the Traffic Engineering department. The controllers are managed by a
KITS Central Traffic Management system. Any new traffic signal controllers the City receives comes
with D4 software installed. Because all of the signals in the City depend on D4 for operation, it is
necessary that the software run reliably, that its usability is satisfactory, and that any issues with it
that may arise are resolved quickly. Therefore, a support contract is needed to maintain the D4
Traffic Signal Controllers.
3.0 PROJECT DESCRIPTION
The objective of this project is to support the City in using and updating D4, which is already in
operation throughout the City's Traffic Signal Network. The selected firm will carry out the tasks
needed to ensure reliability and effective use of D4, including but not limited to training, technical
support, and software updates.
The selected firm shall be familiar with D4, signal operation and timing, NEMA traffic signal cabinets,
and a variety of signal controller hardware, including but not limited to McCain EX2 and Siemens/
Yunex M60 controllers. Knowledge of the KITS central system is desirable.
The proposal shall be structured to accomplish the objectives of the project.
4.0 SCOPE OF WORK
The selected firm would provide management, coordination, service, and preparation of all required
work, which will include but is not limited to the following tasks and deliverables:
4.1 D4 maintenance and updates. Updates must be available to be flashed to the controllers via
USB or from a computer via an ethernet connection. If features of D4 that the City considers
important are removed from a new version of D4, the selected firm shall provide for the City
continued access to the previous version. Deliverables to include manuals and related
technical documents to the City.
4.2 Access to D4 Utilities software, including timely over-the-air updates for D4 Utilities as they are
released.
4.3 On-call user support. The firm shall provide the contact information of key support personnel
to the City. If issues arise, the support personnel shall attempt to provide guidance on their
resolution, but if the attempt fails the firm shall provide tools, a software patch/update, or send
a representative (the same support personnel or otherwise) to resolve the issue at the earliest
practical time. Phone support services shall be available from 8 AM to 4 PM PST, Monday
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through Friday. Email support should be available 24 hours a day. Costs of user support,
including phone payments, time investment, travel, and equipment shall be considered as
included in the contract cost and no additional compensation shall be allowed therefor.
4.4 Biennial in-person D4 training. Deliverables will include all training materials provided to the
City.
4.5 Annual remote training on newly released or modified D4 features.
4.6 Communication of the City's interests for future development of D4. The selected firm shall
provide for the City a reliable channel of communication-direct or indirect-to Advanced
Traffic Solutions, LLC, or whichever entity at the time exercises authority over the
development of D4 to ensure that new features or fixes of software issues can be requested
by the City to be included in the next released version of the D4. In the event that the City's
interests cannot be served by existing or future D4 features, the selected firm shall advise the
City of possible workarounds, technologies, or alternative software that would meet the City's
needs.
5.0 PROJECT GENERAL INFORMATION
5.1 Proposal Submissions
Proposers shall email an electronic copy of the proposal and fee schedule to Yuriy Honcharuk at
Yuriy.Honcharuk@stocktonca.gov no later than 11:55 p.m. on October 9, 2026.
Email subject line shall read, "RFP - D4 TRAFFIC CONTROLLER SYSTEM, WT15022".
The fee schedule must also be emailed, separately from the proposal, to Nguyet Pham at
Nguyet.Pham@stocktonca.gov.
Late or submittal to the wrong address will not be accepted.
5.2 Acceptance or Rejection of Proposal
The City reserves the right to negotiate an agreement with the firm submitting the highest-ranking
proposal. Also, the City reserves the right to reject any and all proposals or to waive any irregularity in
a proposal if it is deemed to be in the best interest of the City. Failure to submit all requested information
could be grounds to reject the proposal.
5.3 Proposal Questions and Requests for Clarification
Any question or request for clarification shall be submitted in writing to:
Yuriy.Honcharuk@stocktonca.gov
Requests for Clarification shall be submitted at least four (4) business days prior to the proposal
due date. If a response warrants an addendum to the RFP, such addendum will be posted on
Bidflash at least two business days prior to the proposal due date. It is the proposer's responsibility to
check the website for any addendums or responses to questions. The website address is as follows:
http://www.stocktonca.gov/services/business/bidflash/pw.html?dept=Public_Works
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5.4 Causes for Disqualification
Any of the following may be considered cause to disqualify a proposer without further consideration:
A. Evidence of collusion among proposers.
B. Any attempt to improperly influence any member of the evaluation panel.
C. Any attempt to communicate in any manner with a City of Stockton elected official during the
RFP process will, and shall be, just cause for disqualifications/rejection of proposer's proposal
and considered nonresponsive.
D. A proposer's default in any operation of a professional services agreement which resulted in
termination of that agreement; and/or
E. Existence of any lawsuit, unresolved contractual claim, or dispute between proposer and the
City.
F. No person, firm or corporation shall be allowed to make or file or be interested in more than
one bid for the same supplies, services, or both; provided, however, that subcontract bids to
the principal bidders are excluded from the requirements of Section 3.68.120 of the Stockton
Municipal Code.
5.5 Licensing Requirements
Any professional certifications or licenses that may be required are the sole cost and responsibility of
the proposer. A City of Stockton business license is required. Please contact the City of Stockton
Business License Customer Service at (209) 937-8313.
5.6 Insurance Requirements
The proposer must obtain and maintain the required insurance to perform the proposed work.
5.7 Confidentiality
The proponent is hereby put on notice that the City may consider all or parts of the offer public
information under applicable law even though marked confidential.
6.0 REQUIRED PROPOSAL CONTENT
The proposal shall contain the following, at a minimum:
* Cover Letter
* Project Team
* Detailed Work Plan
* Examples of Experience with Similar Types of Work
* References
* Cost Proposal
Proposals shall be no more than 15 pages, including covers, and resumes.
6.1 Cover Letter
The letter shall be signed by an official with the authority to negotiate and contractually bind the firm
with the City of Stockton. Provide name, title, address, email, and telephone number for this officer.
Describe any subcontract arrangements or licensing agreements. Include any potential conflict of
interest.
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6.2 Project Team
Describe your team organization including the qualifications of the prime firm and any sub firm. Provide
an organizational chart of the proposed team structure. The following should be addressed:
* Demonstrate the firm's experience in each of the areas of expertise needed to successfully
complete the project. This should include a description of prior experience in working with public
agencies, including working with City staff.
* Ability to provide quality control of all deliverables and be responsive to all issues in a timely
manner.
* Provide project team resumes.
6.3 Detailed Work Plan
Provide a proposed work plan for development and implementation of the program as described in the
Scope of Work. Describe the proposed approach and the activities to be accomplished. Describe how
the team will complete each task. Alternative approaches to the project can be submitted if a rationale
is given for the suggested changes. Information on software which will be used to prepare all working
documents and final documents shall be provided to the City.
6.4 Examples of Experience with Similar Type of Work
Provide examples of projects similar in scope and size to this project. The experience must show that
the Consultant is familiar with federal projects and multi-funded projects.
6.5 References
Provide three client references for the firm, two of which are familiar with the project manager and key
personnel. This shall include the name, company, contact information, and description of related work
that was provided to the client.
6.6 Cost Proposal
Proposer shall provide a detailed cost proposal breaking down each task.
7.0 PROPOSAL EVALUATION
The City of Stockton will follow the firm selection schedule listed below but reserves the right to modify
the schedule in any manner necessary to serve the best interest of the City. Dates are tentative.
Event Date
Post Request for Proposals September 10, 2026
Written Questions submitted by October 5, 2026
Response to Written Questions October 7, 2026
Proposals Due October 9, 2026, 11:55 p.m.
City Council Approval (If required) January 2027
7.1 Proposal Evaluation
This Request for Proposal is not an offer by the City to contract but is an invitation to interested parties
to submit a proposal which the City may accept or reject at its sole discretion. This is a cost and
qualification-based selection, so ranking will be in accordance with the attached Evaluation Scoring
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Worksheet (Attachment A). Evaluation of the proposals will be performed by a Selection Committee
consisting of in-house staff and/or other department staff who will assess the qualifications, experience,
strength of the Firm and ability to perform the work. Please allow for at least ten working days for City
to review and rank the proposals.
7.2 Negotiations
City staff will begin negotiations with the highest ranked firm. If an agreement cannot be reached after
a reasonable period of time, as determined by the City, then the City will terminate negotiations with
the number one ranked firm and negotiations will be opened with the second ranked firm. The
compensation discussed with one prospective Firm will not be disclosed or discussed with another
Firm.
The selected Firm will be expected to enter into a Professional Services Contract with the City.
Instructions to Proposers for the most current insurance and indemnification language. It is expected
that the successful proposer will accept these terms without modification.
The contract shall not be in force until the Council approves the contract and the City manager signs it.
Work performed before the issuance of a Notice to proceed cannot be paid by the City.
ATTACHMENTS:
Attachment A - Evaluation Scoring Sheet
Attachment B - Instructions to Proposers
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