I drive a car now and then in Cambridge and Boston, and I have to be constantly on a lookout for misbehaving cyclists. It's like most of cyclists are not even familiar with basic traffic regulations. If I was not paying extra attention, and was simply following traffic regulations on my end, I would be involved in more that a few car/bicycle accident.
I'm sure you'd say the same about cars if you were a cyclist. Both bicycles and cars are driven by humans and they generally don't give a damn about the rules unless they benefit personally. The difference is that cyclists usually endanger themselves, while motorists endanger others.
