My buddy was once approached by a baseball-bat-wielding man on the Manhattan approach to the Triboro (which btw is at 125 St and 1st Ave). He was able to u-turn and avoided getting close enough to be sure of the guy's intentions. I understand that I'm extrapolating from a single data point, but I don't take that when it's dark any more. Another (more certain) problem with the RFK is that cycists have to climb/descend four different sets of stairs. Great views, though.