N.J. Stat. § 32:10A-1
No tolls shall be charged for the passage of any ambulance, first-aid or emergency-aid vehicle or any vehicular fire-fighting apparatus or police vehicle, operated for the benefit of the public by the State of New Jersey or the State of Pennsylvania or by any county or municipal corporation, or by any nonprofit corporation or organization, first-aid squad, emergency squad, fire company or fire or police department, organized and operating in either of said States over the bridges across the Delaware river of the Delaware River Joint Toll Bridge Commission between New Jersey and Pennsylvania, or any part thereof, and any such vehicle or apparatus shall be entitled to pass thereover without the payment of any toll for such passage.
N.J.S. § 32:10A-1