> You blink once in each direction. So first left, then right. Or the other way around. I've had this a few times from truckers driving through Germany, too, w

> You blink once in each direction. So first left, then right. Or the other way around. I've had this a few times from truckers driving through Germany, too, when I let them merge. Truckers in Germany are from all over Europe so it's hard to tell how European this gesture is