I wasn't too concerned about traffic in the US, even if I had to drive on the wrong side of the road, and remember where to look if I was a pedestrian. For the most part, I found American drivers to be sensible.
OTOH, I did not feel comfortable in a country where every police officer was toting a gun. Although it is pretty much the same here.
Every time I went to a show or sporting event, I was wondering if a crazy would pop out of the woodwork.