http://www.state.nj.us/transportatio.../highways.shtm
In New Jersey, interstate roadways are currently closed to bicyclists; however, most sections are open by special permit issued by the New Jersey Department of Transportation (NJDOT). For a permit to ride on these sections write to:
Bicycle/Pedestrian Coordinator
New Jersey Department of Transportation
1035 Parkway Avenue, PO Box 600
Trenton, NJ 08625-0600