Biggest difference I found moving from Europe was that you can make a right turn on a red traffic in many states in the US (but not in New york city apparently!

Biggest difference I found moving from Europe was that you can make a right turn on a red traffic in many states in the US (but not in New york city apparently!). You have to treat it like a stop sign and yield to any traffic on the road you're joining. Ends making a journey of rights turns much fast than one with left turns, particularly in rush hour