Just come back from Hawaii where I rented a car for a day (Ford Mustang GT) . At first I was unsure about driving on the other side of the road but there's so many cars you just follow them and the roads are fairly well marked with arrows everywhere.
I did notice the lack of direction arrows at the traffic lights - there were a few but in NZ they seem to be everywhere. That made me remember that they have a free right turn at lights (even when red) as long as it's clear - the equivalent would be a free left turn here.
That did make the traffic flow a lot better.
Why don't we do that here?
Part of me believes that we are such impatient and bad drivers that this will cause an increase in car accidents.