... And the concurrent PSA, if you are driving in a city and a car stops in front of you and signals for a turn in the middle of the block, there is a more-than-likely possibility that they don't want you stopped right on their bumper, because they need to back up in order to parallel park.
This is CONSTANTLY happening to me near one of our medical school campuses, which has a large hospital attached. It attracts clueless suburban drivers like sugar attracts flies. I have to go over there for business quite often in the middle of the day, and it amazes me how often I'll signal and pull up, only to have some totally mystified person stop right on my bumper and even yell at me for stopping in the middle of the block. One time it was teens honking the horn at me, and when I got out and said that I was TRYING to pull into the parking space, they said,
"Well, why did you pass it, then?"