Today I was driving on streets that I usually ride my bike on, and was behind a cyclist that was running reds and stops. All the cyclists "violations" were perfectly clean, she never interfered with or affected traffic in any way. After about two reds that I stopped for (I don't run reds while driving a car), she was out of sight, but as it turns out she took the same route I was taking and I finally caught up with her about 5 blocks away. What I noticed was how far ahead she could get by running reds and stops. I am a fairly aggressive car driver in the sense that I don't dilly dally, but I could not really catch her when I was driving normally since there was a stop or light every couple of blocks.
Then I got to thinking. Even when I run reds and stops, the cars seem to be right on my tail almost immediately, and I definitely try to go as fast as I can on my bicycle. The only conclusion I can come to is that drivers will speed up as much as they can to catch a cyclist. Its almost like the chase instinct in dogs when something is running away from them.