Yesterday I realized that my main fear about getting rear-ended on my bike is that there will be a car in front of me. Sqoosh. That happened on the interstate recently where a guy in a pickup was crushed to nothing between two semi trucks. The driver in the back "didn't see them" slow down. Driving on the interstate is like being a biker. You are putting your life in the hands of untrustworthy others in a situation where there is little between you and them and you and the road. The funny thing is I'm less scared on my bike becase there is at least a chance I could bail out or only get minorly hurt. I f I wreck my little car at 70mph I'm dead. Some people think it is irreponsible to bike with a child in a trailer on city streets--but these same people hurl down the highway at 80mph with their children in the back seat without a second thought.
Watch those roundabouts. I've heard of people getting pretty mangled by cars while biking around them. They want to put some in my town. The reason: one of the intersections in question has stop signs, and they want to slow cars down without having to make them stop. I feel a stop sign, though, at least gives me a fighting chance at being seen. Moving cars are notoriously bad at picking out small slow moving objects like bikes, and elementary school kids.