3 March: Exit slowly

That's the fourth time recently, when driving into Durham, that I've got held up behind a funeral.

Is there any sort of etiquette about roaring past a hearse and the following cars when you get to the dual carriageway? Should you raise your hat as a mark of respect? Or simply refrain from cursing the 25 miles an hour procession when you are now definitely going to be late for that meeting?