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Traffic Signals

Our Transportation department maintains 170 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 - You can submit a service request online at or call 311.

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 7-9 a.m., 11 a.m.-1 p.m. and 4-6 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 it.

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. More information on left-turn arrows.

View additional FAQs or for more details about the questions above.

Street Lights

Q - How do I report a burnt out street light?
A - You can submit a service request online at or call 311.

For more information

Phone: 311 or 403-320-3111 (if outside of Lethbridge)
Online: Submit a service request