I was talking with one of my friends about it and he thinks that the reason they keep the speed limits to low is so that you are always breaking the law, and thereby giving the police the right to pull pretty much anyone over at anytime.
...BTW your Bieber avatar is awesome.-Malone
I usually play the +10% game. On highways I'll push it up to +20% for fear of being run over. At those speeds I'm still being passed by many so the odds of me getting pulled over are quite low I think.