Rental Cars

Having driven in Ireland, England, Scotland, Italy, Austria, Germany, Liechtenstein, and Switzerland (plus U.S., Mexico and Canada) I would rate Ireland highest on the nerves level. They charge big time for rental insurance and know you are going to hit a hedge row. Italy comes in second because even the smaller towns have restricted zones and one way streets that will cost you big time if you break the law - and they will track you down through the rental the company. Easiest is Canada for someone from U.S., but get a bigger car than I did last time. Finally, nothing beats driving through the Italian Alps and surviving.

Ireland

Canada The Italian Alps