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.
Mercedes don’t let you merge, and don’t ever look at you.
BMW drive like they are unaware of any other cars on the road.
Subtle but different