Traffic signal management

The Traffic Management Centre (TMC) operates a computerized traffic signal management system that allows traffic engineers to monitor and control the operation of The City's traffic signal network.

In 2020, the TMC replaced its 22-year-old Central Traffic Control System with an advanced system called TransSuite. All signals are now connected to the new server and transmit real-time, second-by-second green times and other status to the TMC. This new system has better alert and reporting capabilities and allows engineers to diagnose signal issues remotely.

There are 1,300 traffic signals in Calgary, all of which are connected to the TMC. This is accomplished by a combination of fibre optic, wireless, and cellular technologies and was completed in 2025.

TransSuite monitors the traffic signals for proper operation and collects data on traffic flow, such as volumes and speeds from vehicle sensors at the intersections. The signal system also interacts with the LRT system, some of the bus routes and some of the fire routes by providing priority for these vehicles.

The system can override the normal operation of traffic signals when necessary. Special events like hockey games or concerts at the Saddledome or major road construction may require a short-term adjustment to the signal timing.

In Calgary, there are 70 coordinated corridors which comprise of 540 signalized intersections.

Many factors can impact the operation of traffic signal coordination. The main one is a possible disruption of signal communication to the Central Traffic Control System. If communication to central system is lost, the MOC is unable to coordinate the signals. For this reason, the TMC works very closely with the staff in the field to ensure communication is maintained at all times.