Princeton, NJ Route 35 South to 537 West to 33 West to Route 571 . Continue for approximately 12 miles on Route 571 until you reach the intersection of Route 1. Continue straight on 571 across US 1. Once you cross the intersection, Route 571 becomes Washington Road. Continue on Washington Road across a bridge until you come to your first traffic light. Take a left at this light onto Faculty Road. Take your first right onto an unmarked road. This road is maked as Elm Road on your map, but there is no street sign. Proceed to the guard booth and the Public Safety officer on duty will assist you.