From my own experience, the police don't care about motorized bicycles in the suburbs of Chicago. Most laws in Illinois say anything over 49cc without a pedal assist and over 20mph is considered a moped. I'm 14 without a license or any sort of registration in hand.. even better, I drive around a 212cc motorized bike with turn signals and a front light. The reason I say that the police don't care is because I'm following simple traffic laws, i'm not being stupid when it comes to riding a machine like this. I have a pal I ride with and we have passed dozens of police cars, half of them don't seem to care.. the other half will take a second look but then forget about it.