The first time I'm back on my regular commute in six weeks (long story), I see at or near the top of the Queensboro Bridge the aftermath of what appears to be a single-rider crash. Note that on the QBB there have been for quite some time, work crews with their pick-up trucks on the bike path even at the early hour that I commute (cross around 7:45).
What I saw was a guy in a t-shirt and shorts, holding a compress of sorts to his bleeding forehead. The t-shirt was badly stained with blood, and the guy was in obvious discomfort, though we has sitting up on his own. I stopped briefly to ask the workman tending to him if I could and he shook his head. As I rode past him, I saw what looked like a black Raleigh carbon road bike whose top tube appeared to have been sheared in the middle.
Honestly, I'm not surprised I saw evidence of a crash. The surprise is that I haven't seen it sooner. The workmen aren't especially cautious around the cyclists on the bridge. I'm going to guess that the crash involved the crew (edit: I was wrong). Also, I'm going to say that the cyclist was not wearing a helmet (edit: I might have been wrong), because I didn't see one and it would be hard to get a bloody wound where his was while properly wearing one (anti-helmet crowd in 3... 2...). I might be wrong about that, though, as I didn't pause for long.
UPDATE: Found out what really happened.