Where exactly are you off to Sim?

As laws are different in many states. For example we drove from Nevada to California recently. There are 2 laws that were diferent.

In Nevada, unless a sign tells you different, you are allowed to turn right on a red light if it is safe to do so. Also, in Nevada you can perform U Turns, where in California you can't.

At box Junctions, you will find that people take it in turns, going clockwise.

You will enjoy driving in the USA, it really is no bother at all, drivers are generally far more courteous then you will find over here.

Have fun mate.