The Secret Formula Behind Yellow Traffic Lights
Ever wondered why some yellow lights feel like they last forever while others seem to vanish in a blink? Turns out, there’s a simple math trick behind it—and it’s been right in front of us this whole time.
The Length of a Yellow Light
The length of a yellow light is based on the speed limit of the road. Take the first digit of the limit, and that’s how many seconds the light stays yellow. Driving in a 50 mph zone? You’ve got 5 seconds to decide whether to stop or go. On a 35 mph road? That yellow lasts 3.5 seconds—which explains why it always feels so quick!
It’s all about safety and reaction time. Faster roads need longer yellows so drivers have enough time to slow down without slamming the brakes. Slower roads? The timing is shorter because you should already be cruising at a manageable speed.
So next time you hit a yellow, do the math! And if it feels unfairly short? Well, at least now you know there’s a method to the madness—even if it doesn’t always work in your favor.
