Traffic Signals & Signs

The City of Diamond Bar's Public Works Department is responsible for installing, programming, maintaining, and repairing all traffic signals and signs along city roads. This includes setting timers and pavement sensors at intersections to control the flow of traffic, ensuring the safe and efficient transport of both vehicles and pedestrians.


Additionally, they also mark lanes, crosswalks, and traffic patterns on road surfaces, and regularly monitor traffic signs and signals to ensure that they are visible and operational and keep pavement markings clear and identifiable at all times.

Contact Information
909.839.7040
publicworks@diamondbarca.gov