There is a street near Prospect Park (I think the name is Park Plaza West...something like that) that has a bike lane (on the left side of the street for some reason) that is about the same width as the regular lane for traffic. I often take this street on my way home as it allows me to avoid this high traffic roundabout. At certain times of the day (around rush hour when the traffic is heavy) there is always at least one (usually 3-5) car[s] driving in the bike lane to cut ahead of backed up traffic.
With that explaination out of the way, today I was riding on that very street, and at the intersection where the bike lane ends there was a police van, with an officer stopping all the cars that were driving in the bike lane and giving them tickets. That particular section of street is curved so you can't see the intersection (where the cop was positioned) until you are only a few yards away. I imagine he busted quite a few drivers as I personally saw him ticket 4 cars.
I gave the officer a little nod as I was waiting for the light to change.