Why does the red traffic light indicate stop?
Why does the red traffic light indicate stop? Well, it's important to know that before there were traffic lights for cars, there were traffic signals for trains. At first, railroad companies used red to mean stop, white to mean go, and green to mean caution. Red is the color with the longest wavelength, so it can be seen from a greater distance than other colors. When does the car shut down at a red light? The technology will shut down the car's engine when the vehicle is stopped at red lights or in traffic jams. How they work: When you're...