Around here, they made it law (or so I had heard, still not sure if it actually is) that you have to wear a helmet while on a bicycle. I was around 12 or 13 at this time, and bicycle cops were around everywhere enforcing it/encouraging it. I used to carry a backpack with my helmet in it, and if I saw a cop, I'd hide behind a building or down a side street and put it on until I was in the clear
