Well; there will STILL be about the same AMOUNT of cars in those fewer lanes.
To get the same VOLUME of traffic down the road, a speed increase HAS to occur, and the cars would HAVE to be running CLOSER together.
Seems like it would be MORE deadly for someone to cross!
Think of a broad, slowly moving river, that gets narrowed down to go through a canyon.
My point is that the fewer lanes may encourage more people to take that chance. Not too many think they can out-dash four lanes of traffic, but two? Maybe more.
And in Times Square, speed may or may not come into play, since there are lights every few yards at every block crossing.