2 ms·

> The oncoming traffic doesn't stop until the light turns red. Wait, why? No new car should enter the intersection when the lights turn to yellow. The yellow l

• sokoloff 9y ago
  > No new car should enter the intersection when the lights turn to yellow. Cars will obviously enter the intersection under a yellow. It's why we have a yellow. Even if everyone wanted to stop for every yellow, at 35 mph with average reaction time, cars will travel a minimum of 100 feet after the yellow phase starts. Some of those cars will enter the intersection. With a typical 4 second yellow, some drivers don't even choose to stop for the first half of the yellow, of course.
• kd5bjo 9y ago
  In the states, there's often a 1-second all red cycle to let the intersection clear, because drivers treat a yellow light as a green that's about to expire. Even with this, I often see 2 or 3 cars enter the intersection after I already have a green signal.