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Traffic Signals

City of Lethbridge Transportation maintains 153 signals in Lethbridge. We regularly evaluate the signal operation by conducting traffic/pedestrian counts, studies and warrant calculations. 

Frequently Asked Questions

Q - How do I report a traffic signal light not working?
A - Email trafficsignals@lethbridge.ca or phone 403 320 3850.

Q - How are traffic signals warranted?
A – The traffic signal warrant procedure considers pedestrian and vehicle volumes, intersection characteristics and adjacent land uses.  To assess an intersection for the installation of a traffic signal, a six hour pedestrian and vehicle count is undertaken. The typical count hours are 7 a.m. - 9 a.m., 11 a.m. - 1 p.m. and 4 p.m. - 6 p.m. A minimum warrant score of 100 points is needed for a signal to be considered as warranted.

Q - How are vehicles detected at traffic signals?
A – Vehicles are detected by inductive loops placed in the roadway which sense the variations in the magnetic field influenced by the presence of a vehicle. Video cameras, microwave detectors and magnetometers are also used to detect vehicles.

Q - Why does the signal turn green for a side street when no one is there?
A – There could be a problem with the vehicle detection or pedestrian push button. An emergency vehicle may also be approaching the intersection and the traffic signal could be giving priority to the approaching emergency vehicle.

Q- I have never seen the left turn arrow working at an intersection, is it broken?
A – No, typically, these left turn arrows are not broken, but they have not been activated. Traffic Signal division reviews left turn warrants frequently and will not activate a left turn arrow unless warrants are met. Click here for more information about left turn arrows.

Click here to view additional FAQs or for more details about the questions above.

Street Lights

Q - How do I report a street light burnt out?
A - Email streetlights@lethbridge.ca or phone 403 320 3850.