They do not block it off.. They do however usually post a cop or two there not because its privet property, however if you step off the road to either sides you are in someones front yard. They don't want people doing stupid things like put blood on the bridge or w.e..

Anywhere down in clifton if you get out of your car and walk around is bound to creep you out, no reason to go asking for trouble with the police at bunny man bridge.