How does a traffic light decide when to change?
Traffic Light's Secret
How does a traffic light decide when to change?
You're sitting in the car, watching the red light. It feels like forever. You start wondering: is someone watching? Is the light thinking? How does it know when to turn green?
Here's the secret: buried in the road under your car, there's a loop of wire. It's called an induction loop, and it's basically a metal detector — except instead of hunting for treasure, it's hunting for cars.
