The City is responsible for the installation, operation and maintenance of traffic control signals. Traffic control signals are electronic devices that are designed to assign the right of way to the various traffic and pedestrian movements at an intersection. The objectives are to: advise road users of traffic regulations to encourage compliance with the law, warn of intersecting roadways or road hazards, and provide the information necessary for users to safely navigate through intersections.

As of July 4, 2017, there are 2,339 traffic signals in Toronto.