Traffic Eng & Safety

Travel safety, complete streets, advanced signal tech, and VMT as a metric for environmental analysis in California

Traffic Signal Diagnostics & Maintenance

This introductory course covers the essential operational functions of traffic signals and components, starting with basic design plans and diagrams, general rules, and specifications.

Participants will learn about signal cabinets and components and how they function, traffic signal detection and calibration, wiring, power, and basic diagnostic skills.

Additional course detail is provided in the sections below.

  • Course Topics
    • Traffic signals design basics
    • Design from maintenance perspective
    • Inside the traffic signal cabinet
    • Vehicle detection
    • Wiring of traffic signal
    • Service box considerations
    • Troubleshooting of malfunctions
    • Signal turn-on & acceptance
  • Course Outline

    Signal Design Basics

    • Major Elements of Plans
    • Plans Standard Symbols & Equipment
    • Phase Diagram Accuracy and Notes

    Design from Maintenance Perspective

    • Checklist Approach
    • How to avoid Conflicts & Change Orders
    • Submittals Review

    Inside the Traffic Signal Cabinet

    • Cabinet Types and Sizes
    • Essential Components and how it works together

    Traffic Signal Detection

    • Types of Detection
    • Calibration Techniques
    • Installation & Maintenance

    Wiring of Traffic Signals

    • Basics & Essential Tips
    • How to Specify Neatness
    • Box Size & Specifications

    Service Box Considerations

    • Types and Placements
    • Streetlights Connections
    • Battery Backup & Generators

    Troubleshooting & Malfunctions

    • Arrival Safety
    • Diagnosing the MMU
    • Industry Tools
    • Labeling

    Signal Turn-on & Acceptance

    • Safety Checklist
    • Vehicle Phases
    • Pedestrian Phases
  • What you will learn

    Students learn how to interpret traffic signals plans, diagnose malfunctioned signals, make better infrastructure decisions, and reduce the risk to your agency related to malfunctioned traffic signals.

  • Who should attend

    The class is for traffic engineers, electrical contractors, and technicians who are new to traffic signal timing. Experienced practitioners who desire a "refresher" course also benefit. Advanced practitioners with significant experience may not be appropriate for this basic course.

  • Course Prerequisites

      [no prerequisites identified]

  • Course Instructors

      Rafat Raie, PE, Deputy Director of Public Works, City Traffic Engineer, City of San Rafael

      Mr. Raie has nearly 30 years of Traffic Engineering experience including design, operation, planning, and maintenance. As an instructor with ITS Tech Transfer for the past nine years, he has shared his professional experience in pedestrian facility design and operations in communities throughout California. He has a well-rounded experience in traffic signal systems, parking systems, innovative pedestrian facilities, and ADA standards.

      Leonard Gilliana, Lead Signal Technician, City of Walnut Creek (retired)

      Mr. Gilliana is the Lead Signal Technician for the City of Walnut Creek. During the past 32 years, he managed the implementation of four signal master upgrades, participated in the design and implementation of the upgrades of communications systems, traffic signal controllers and all related choice of signal cabinet equipment. He developed a routine maintenance program which almost eliminated all malfunction calls.

  • Registration Information

      Registration for this course occurs at the TechTransfer training host site. Use the button to the right to directly access the course page and registration portal. You will be asked to create a user account as part of the registration process.

      A confirmation email will be sent to you within two business days of TechTransfer receiving your paid registration.

      If you have any questions or need assistance, please contact the TechTransfer Registrar at (510) 643-4393 or

  • For more information

      To learn more about TechTransfer courses and credits, see their FAQ (

      To learn more about TechTransfer's cancellation, refund, and substitution policies, see How to Enroll (

      Cancellation Policy:

      The cancellation fee for this course is $75. At TechTransfer, there are no refunds for classes with registration fees of $75 or less. For all other classes, you may cancel your enrollment and receive a refund of your registration fee less $75, provided they receive your written request to cancel at least 5 full working days before the class is scheduled to begin. In lieu of canceling your registration, you may (1) transfer your registration to another TechTransfer class, (2) receive a tuition credit for the full amount, useable toward a future class, or (3) send a substitute in your place.

      Note: TechTransfer recommends you discuss any possible problems or online security issues with your IT person before you register for any online classes. If you are worried about connectivity issues, please contact the online training coordinator the week before the class to schedule a time to test your system. If you do not test your system and you have technical issues during a live online class, we will not provide a refund.

LTAP Subsidized

This class is offered at a reduced fee to employees of California's city, county, regional, and tribal public agencies

Course Fee

Standard Rate:

Public Agency Rate:



[information not available]

Course Credit

This course grants:

0.80 CEUs

Upcoming Sessions (0)

[not currently scheduled]


Need More Help?

California LTAP Center

Phone: (562) 985-2872