I am going to guess it is right here:
http://maps.google.com/maps?queensborough+bridge
Looking at street view for a block up you can see there is no guard rail on the turn the the curb looks to be a rather low.
There is a potential area on the other end of the bridge (a tight 90 deg turn after a long run on the bridge, but there do not appear to be any shops in the "landing zone".

