rode the streets in Cambridge Sunday and it was a real mix. they have bike lanes filled with parked cars. transit buses pulling in and out constantly and red lights almost every block along Mass Ave between Porter Square and Arlington.
sometimes I had a bike lane; sometimes the bike lane was within the 3' of the parked cars so I couldn't use it; sometimes the right lane was free and I had it to myself; sometimes I filtered; and sometimes it surprised me but it was much safer to just wait where I was a few cars back from the light. honestly there were even some spots where it just made more sense for me to take the left through lane (and I did)
http://maps.google.com/maps?f=d&sour...01013&t=h&z=20