Leeds and Paris. Leeds I think is pretty much peculiar to me, but I find it worse than London rush hour. And everyone hates Paris driving, either in it, or the route periphique.
Moscow. A scrum in some spots.
Limerick, because there is, or was, a bottleneck set of traffic lights that would only let about two vehicles through at a time, then you had to wait for about a year for the next turn.
Nottingham, because although it's not too bad in itself, once in, I can never get out.