Most cars in America have, at most, three colors of lights on the outside. There’s white for headlights and reverse lights, red for brake lights and rear lights plus, in some cars, amber for turn signals. Mercedes-Benz has just gotten approval to add a fourth color. Turquoise blue lights indicate when a Mercedes car is driving itself.
To confuse with traffic lights, brilliant! But seriously, the amount of people that hit the gas when they see green in their periphery is high.
Which state is it?
Wisconsin, but I think a lot of states have a similar law. But yeah green maybe isn’t the best choice either.