Traffic Engineering maintains and operates over 100 traffic signals within City limits. The latest computer simulation and optimization models are used to develop and implement signal timings at all of the city intersections. The data inputs to the models include traffic volumes, lane configuration, posted speed limits, crosswalk length and other physical characteristics of the roadway that impact traffic flow.

Traffic Engineers determine the need for synchronized lights by time of day from traffic volumes collected by the signal controllers. Depending on the roadway type and the need for keeping the lights synchronized, several signal-timing plans are in the City throughout the day. The direction with heavy traffic volumes will have better progression if the traffic signals are coordinated. For example, in the morning commute, westbound or outbound progression is favored over the eastbound or inbound progression. In the Core Area, the signal timing is more challenging and the system balances traffic flow between major left and right turns, and the through traffic.

Micro simulation and optimization models are used for the operational analysis of individual intersections and the entire network of arterials. Click here for a graphic of the optimization model. The following reports are some recent reports related to traffic signals and operations:

Fact Sheet - Citywide Signal Timing Project (in PDF)
Traffic Signal Management Report (in PDF)