In Manhattan + this is a vignette for the thread "taking the lane" - signaling doesn't matter most of the time. This morning I signal, get cut off at turns, jumped when taking lane, spouted expletives at and get treated pretty much as a roadway bottom feeder. What I would do sometime to have a lit metal-piercing bottle rocket!
Sadly, Central, Prospect Park and the Westside MUP are the most viable roadways available without cars. Getting there is 3/4's the battle. NYC sucks because most drivers here could give a toss about what is right. In short -without moral, or ethics while on the road.