At most traffic signals several different timing plans are used throughout the day to account for varying levels of traffic demand. The length of the wait depends on the signal cycle length and amount of traffic. In general, a longer cycle length increases the amount of vehicles that can be moved through an intersection (capacity). Increasing cycle lengths also increases driver delay.
Cycle lengths range from 60 seconds to 140 seconds in the City, depending on the size of the intersections and the amount of traffic. Cycle lengths must be longer at larger intersections to serve the greater number of separate traffic movements during the timing sequence, to accommodate much longer pedestrian crossing times, and to accommodate higher volumes of traffic.
Requests for timing changes at individual intersections should be referred to the Traffic Department. Information needed for a signal technician to investigate a requested timing change is what day of the week and what time of day a problem occurs. Call the Traffic Engineering Division at 707-543-3814.