Since 1997, the City of San Diego has converted more than 32,000 incandescent lights to LED. Lights on major thoroughfares are programmed to stay green longer during peak travel times (rush hour). The computer observes the amount of traffic flow and can trigger the lights for cross traffic. Each signalized intersection is run by its own computer similar in size to a 286 PC. In some areas, such as El Cajon Boulevard, Miramar Road, Mira Mesa Boulevard and Downtown, traffic lights are coordinated to facilitate commuter or otherwise heavy traffic flows on major streets. A point system, based on traffic flow and the accident rate at that intersection, is used to determine whether a signal is warranted. The process of determining where traffic signals are installed is a complicated one. The monitors are thoroughly inspected and tested annually. Safety monitors are installed at all intersections to prevent conflicting green lights from being displayed. All signalized intersections are on a quarterly preventative maintenance schedule. Our signal technicians work around the clock to keep the signals functioning properly. When there is a problem, we respond within one hour. Traffic signals are top priority for Street Division. There are over 1,500 signalized intersections within the City of San Diego.
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