When I told the driver he was parked in a lane reserved for bikes, he gave a snotty answer and rolled up his window. A minute later, after I had pulled up in front of him to take a picture of the van in front, he started honking me out of the way. A policeman had been watching and issued summonses to all three illegal parkers on the block. Satisfaction! Many drivers move if you ask them nicely. Don't give up. This one got what he deserved.