How are the yellow lights at signalized intersections timed?
Yellow lights times in the City of Grande Prairie are designed depending on the speed of the road, deceleration rates of vehicles and the reaction time of the driver. The length of yellow lights will vary from 3 to 6 seconds as speed limit increases from relatively low to relatively high. However, it is common in the City of Grande Prairie that 3.5 to 5 seconds is used, where speed ranges from 50 – 70 km/hr.
