"One bad thing about driving in the US is the 55 mph max speed in most states".
I've been to the States three times now, once when I hired a car and twice on my own bike. I spent three months and 15,000 miles last summer riding from New York to California and back again.
Whilst some states have a 55mph limit, many don't. I think (I may be wrong) that New Mexico and California have a 75mph limit. If you think of the US as fifty different countries, each with it's own laws. Police, Governors and Senators. Helmet law is different everywhere, as is filtering (lane splitting). California is OK, everywhere else it's a no-no. Frequently I saw signs telling drivers to move back to their right after overtaking but they have their fair share of middle lane roadhogs too.
Getting back to the speed limits, I rode at about 80mph everywhere and that was what many of the drivers were also doing. I had no trouble (this time). The thing is not to stand out from the crowd and greatly exceed the speed of the rest of the traffic. In 2002 I did get a bollocking for riding a fully laden bike from a cafeteria 15yds to the gas pumps whilst not wearing a helmet! And I got pulled over for filtering up to the front of a queue of traffic stopped at a temporary traffic light in the middle of a desert.
I absolutely loved riding in the US - great big open spaces, quieter roads, big horizons and skies. Having said that, they are driving quicker and quicker these days and will soon be catching up with our cagers. The average speed of cars between Maidstone and Dover on the M20 must be around 90mph these days.