I will say if it’s one slow poke in front of you and there’s a row of cars behind you, the respectable thing to do is flick your high beams quickly twice. Most normal people will move over to the right and let you pass. If now you’re not going fast enough for the other cars behind you, you move over right.

If there is a few cars a head of you going slow, do the same thing, the driver in front of you will flick their lights to the person in front of them, the message travels to the slow poke, and ideally they move over.

Someone flicking there lights quickly twice should make anyone mad. Flick lights don’t tailgate.