Yellow light innovations

In the States, you wait at a red light, then suddenly, out of nowhere it turns green and you go. If you're not paying attention, you might miss the switch. Then it turns yellow, so you can anticipate the next red.

In Europe, the yellow light is used both from green to red and from red to green. So when you're sitting at a red light, you can prepare for the upcoming green. It makes so much sense.