What you might not know is that the lane assignments for bicycles are all over the place in NYC. It's almost impossible to remember what arbitrary choice the city has made for which stretch of bridge, greenway or park--and they're all marked differently, too. White lines, green lines, yellow lines, and the directions of travel are handled differently from stretch to stretch as well.

For the most part, experienced cyclists will stay right and pass on the left. The ones who don't know what they're doing (which sometimes seems to be most of those who are out in the summer) are no more predictable to us than they are to you. I change my route, when possible, to avoid summer cyclists.