I gotta add this for driving on interstates. I was coming home a few years ago from Colorado. I was south of Chicago on 294. I was going 60 in a 55 in the outer lanes, the slower lanes, you know, slow traffic keep right. People were passing me left and right. Hey, I was in the outside lanes man. When I saw this dude on a ten speed pass me and flip me off for going to slow, ( j/k, we know ten speeds can't go that fast!), I felt it was in my best interests and SAFER to at least keep up with the majority of traffic, screw the ticket. Which meant going between 70 an 80 in a 55MPH zone. And that one reason is why unlimited speed limits won't work here in the states, slower drivers feel it's their RIGHT to go slow and be a HAZARD in the fast lanes.