For me, the worst thing would be "muscle memory". Never had a problem driving a rental car with right-hand-drive in the UK or Ireland. Different thing was the b

For me, the worst thing would be "muscle memory". Never had a problem driving a rental car with right-hand-drive in the UK or Ireland. Different thing was the bicycle, after stops, I often forgot to start driving on "the other side", and I suspect I would be just as easily fooled in a car with left-hand-drive.