Do any countries use red and green but not yellow for traffic lights?
China uses only red and green with countdown timers next to the red lights so you know how long you will be sitting at a red light. It is not uncommon for a driver to see it counting down from 60 to just shut off the engine. The green lights flash when they are expiring. [I have been in China for a month and a half and can only speak to the few provinces I have been.
In Mexico, the green lights will start flashing at the end of to indicate that the yellow lights are about to be come on. It’s kind of useful in judging if the yellow light should really mean “speed up” or “slow down.” And in France, they have those mini-lights next to the regular ones, that tell you if it’s OK to turn right on red, or not – usually depending on the time of day. I always thought that was better than having to read some sign about time restrictions.
