I'm 15 and I just got a new road bike like 4 weeks ago. Two days ago i went across a round-about and car on my left didn't give-way and hit my back tyre. i wasn't wearing a helmet and i didn't have lights on my bike. I got a head injury I was taken to the hospital in a ambulence and i had to get my head glued. I was aslo forced to get a blood test to prove that i wasn't drunk. It was the first time since i got the bike that i rode it without wearing a helmet. It could of been alot worse then what it was and the people who saw it said i was lucky i wasn't run over by anouther car. Wear your helmet. Dont be an idot!