I live in the U.S but have driven in the UK, Ireland, Wales and Australia. The difficulty I noticed is that when crossing the street on foot or driving, I was in the habit of looking left first rather than to the right and wanting to go right into a roundabout rather than left, which can be disastrous.
In Brisbane Australia a few minutes after renting a car we were in a pretty bad accident when an 84 year old man came out Into traffic from a parking lot and hit us and then went up onto a sidewalk and knocked down the supports for the overhanging roof of a store, which came crashing down. I automatically assumed the accident was my fault since I didn't feel sure of myself yet. The Police came but I wasn't ticketed and thankfully there were no injuries. I had to pay for the damages of my rental car upfront before I could leave the country. Later when I got home, the other drivers insurance Co. tried to make me pay for the damages to his car which was totaled. I viewed the intersection on Google Earth and determined that there was no way I could have been at fault. Since I wasn't ticketed and since they couldn't give me any proof that I was at fault, they stopped pestering me. After that narrow escape, we took the train everywhere and did the same in Europe this past summer.
I think that's what I will do from now on....a lot cheaper and less stressful.