How good are you at obeying the speed limits?
The other day I was driving down the motorway with my music blaring, I was singing along at the top of my lungs and when I looked down at the speedometer I realised I was going 100MPH when the speed limit is 70MPH. It wasn't intentional so I slowed down straight away.
Aside from that incident, I would say the majority of the time I don't stick to the limits. It's always intentional though. If I know there is a stretch of road where there are no hazards and the limit has dropped down to 30MPH then I'll probably do a little bit more.