i actually witnessed a cop giving a ticket to a driver for doing this the other day on my commute in to work. As I rode by, I couldn't help but smile a little.
I tend to expect it though, because boston has some of the WORST drivers i've ever seen. Even in my car I expect to get right hooked by some yahoo cutting over a lane of traffic to make a turn down a street. The people here just don't seem to care if there's anything in their way.