Three years ago I moved from leisure biker to bike commuter after taking the course Biking 101 offered by MASSBIKE. In that course I learned to stay to the right of the road, obey traffic signs, and use hand signals. I currently bike about 50% of the time. When I drive I am aware of how drivers generally know the rules of the road and follow them. In the MASSBIKE course it was pointed out that most bikers are still biking with the knowledge they had as 8 year olds! People who use their bikes to commute need to invest in lights (front and back), helmets (for sure), bike bells to alert people that you are near them, and need to use hand signals and stop weaving in and out of traffic. As a biker, I get really irritated when I see irresponsible bike behavior!