[nik-]

It's not like "slower traffic keep right" is a European concept. I learned that long before I drove in Europe. The concept is universal.

The highway is not a place for you to stand your ground on what you perceive to be a speed others should drive. The sign says "Slower traffic keep right" not "traffic going slower than the speed limit keep right". If someone, in your mind, is being an ####### by driving too fast in your opinion, just move over anyway and let them go by.

The concept is so simple that I don't even understand why people feel the need to argue about it.