I second the comment suggesting you look up the laws in your state before riding your bike. In Nevada, the Office of Traffic Safety puts out a small booklet with pertinent laws for bicycles and for motor vehicle drivers' responsibilities towards bikes in traffic. Very handy. It is incumbent on you to know what you can and cannot do on the road.
As for the anti-helmet folks, from what I've read they post, the majority aren't really concerned about helmet safety or protection; they just obsess over someone telling them what to do. An understandable emotional response, but cutting off the helmet to spite the head seems a bit childish.
I would be interested to see safety comparisons between different sports' helmets, ie, rock climbing, snowboarding, skateboarding, cycling, etc.
Leo H.
Sun Valley, NV