[philjohn]

You flash your headlights at them. If they still don't move that's what your horn is for.

All joking aside though ... you don't pass on the right, so if they refuse to move you need to slow the heck down and follow.

[geff82]

Believe me, after a few seconds of waiting I always pass slowly on the right. It might not be legally perfect, but is the accepted way of handling drivers that are an obstacle on the left.

[victorp13]

This is not at all "the accepted way" in Germany.

[samoa42]

the people going 100kph in the left lane will protest, ofc. but they cannot stand in the way of progress and will be overtaken on the right lane ;-)