Most, or at least many things here are the way they are because that’s the way the Brits do it.
I once drove in a country where they drive on the opposite side. The problem I had was exiting roundabouts. I’m well used to them here, but for some reason when I’m going the opposite way around a roundabout, none of the exits look right.
I think I went around the roundabout three times while discussing it with the lads in the car.