Yellow Light Line Calculator

What is a Yellow Light Line? Learn more here.

This calculator identifies how far from the end of the intersection a yellow light line should be painted that would give drivers a visual reference of when they should stop vs. when they will safely clear the intersection while traveling at the speed limit.

Edit the speed limit and yellow light length to calculate the appropriate yellow light line distance.


distance = ([speed limit (mph)] × [5,280 ft]) × ([yellow light length (seconds)] ÷ [3,600 seconds per hour])

Intersection diagram credit: by Jonathan (Own work) [GFDL or CC-BY-SA-3.0-2.5-2.0-1.0], via Wikimedia Commons

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