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Traffic Signal Course Description
Electrical Technology Program


The traffic signal courses are designed to advance the skills of technicians with prior traffic signal experience and to give students with electrical or electronics training skills needed to enter the traffic signal field.

        Elect 280 - Traffic Signal Systems 1

  1. Introduction to traffic systems
    • Overview of signals, cameras, ramp meters, count stations, pumping plants.
    • Review of electrical concepts and components.
  2. Code, standards and regulations
    • CalTrans Standards; National Electrical Code (NEC) requirements.
  3. Copper conductors in traffic systems
    • Ampacity, insulation, color code, conduit, pull boxes
  4. Power and cabinets
    • Service entrance, 332 cabinets (signals), 334 cabinets (CCTV and other devices)
  5. Timing Sequences and Input Files
    • Signal Phases; Loops, Pedestrians, Emergency Vehicles
  6. Timing Sequences and Output Files
    • Load Switch, conflict monitor; Poles & Signal Heads
  7. Lighting Systems
    • High-pressure sodium; Illuminated street name signs.
    • Handling callouts and signal knockdowns.
  8. Design and Construction Activity
    • Design of required elements and installation of service entrance cabinet.
  9. Controller Cabinet Construction
    • Design of required elements and installation of 332 Controller cabinets.
  10. Traffic Loops
    • Theory of Traffic Detection Loops; Problems with loops
    • Installation of traffic detection loop.
  11. Power Poles
    • Install poles/heads; Pulling wire/cable; Splicing/soldering.

        Elect 283 - Traffic Systems Communications

  1. Introduction to Communications
    • Transmitters, Receivers, Antennas
    • Review of electrical concepts
  2. Overview of Systems used for Traffic Control
    • Microwave links, Modems, direct connections
  3. Vision Systems
    • Traffic Monitoring
    • Traffic Detection
  4. Network Communications
    • Ethernet in Traffic Control
    • Proprietary network systems
  5. Antenna Systems
    • Antenna Types & Selection
    • System Measurement, Standing Wave Ratio, Power, Patterns.
  6. Troubleshooting Communications Components
    • Typical problems encountered & solutions as applied to receivers, transmitters and antennas.
  7. Receiver Alignment
    • Typical problems encountered & solutions as applied to receivers, transmitters and antennas.
  8. Transmitter Alignment
    • Setup of transmitter outputs and FCC regulations
  9. Troubleshooting Communications Systems
    • Troubleshooting practices as applied to entire communications systems.
    • Internal problems
    • External sources of trouble

        Elect 284 - Traffic Signal Controllers & Digital Systems

  1. Introduction to Digital & Microprocessor Systems
    • Review of electrical concepts and components
    • Basic Digital Logic, truth tables, voltage levels
  2. Traffic Signal Controllers
    • Introduction to controllers from various manufacturers
    • Controller Component Identification
  3. Signal Levels and Measurements in Digital Systems
    • Propagation delay, voltage levels
    • Use of Logic Analyzers, Oscilloscopes, Voltmeters
  4. Components of a Microprocessor System
    • Processor, memory, input/output, power supplies
  5. Electronics for Control and Monitoring of Traffic Control Devices
    • Input Electronics
    • Output Electronics
  6. Troubleshooting Input Electronics
    • Typical faults, identification of problems
  7. Troubleshooting Output Electronics
    • Typical faults, identification of problems
  8. Troubleshooting Traffic Signal Controllers
    • Identifying problem source
    • Best method for repairing problems