California

California's state laws mandate the use of bike helmets for passengers under the age of 5, riders under the age of 18, and users of scooters, skateboards and rollerblades. This means that if you're carting around the little ones in a bicycle rickshaw, they must wear helmets. If you are a bike rider under the age of 18, you must where a bike helmet. If you ride a scooter, there may be special scooter helmets for your purchase. And no matter how silly you think you'll look skateboarding with a helmet, you'd look much sillier if you fell without one. Typically, people who crash wearing a helmet say they're glad they had them, while people who crash without helmets say they wish they'd had one.