Many drivers enter intersections on a yellow light.
This causes traffic jams.
A yellow light means: stop.
People want to drive fast.
A yellow light is not an extension of green.
A yellow light is a warning.
Traffic lights change quickly.
Drivers don't have time to think.
Traffic jams form easily.
Calm waiting helps.
Traffic lights detect cars.
If there are no cars, the light changes faster.
In the future, drones may help.
Drones will check if drivers follow the rules.