A Traffic Signal Technician installs and repairs traffic control equipment, and maintains electrical systems and microprocessor-based controllers including relays, wiring, conflict monitors, signal suspension cables, poles, communication modules, underground conduits, related lighting, and vehicle detectors. Technicians also handle calibration, troubleshoot circuit boards, run diagnostic tests, analyze data of traffic flow and design timing of signal control devices. Lastly, Traffic Signal Technicians review inventory to ensure you have the tools and replacement parts needed. Technicians usually work independently and reports to administrative management.