Occasionally, I'll catch some traffic stuck behind a slower vehicle on a two lane road. It's always seemed to me the first person in line behind the premier member of The Anti Destination League has first choice on passing - if it's clear, they should go first rather than having impatient followers try to jump their turn.
Jeffro's Rule In This Case is if the following vehicle turns down three or more clearly safe chances to pass, then they have forfeited their right to have the first turn. If they aren't even peeking around to look for several miles, that counts as forfeiture as well.
If it's clear enough for me to wind up the ol' big rig, and Joe Follower is too indecisive to make the big move, too bad. I'm going.