N.J. Stat. Ann. § 27:5A-1

Whenever any public road or highway is located wholly or in part within the limits of a United States military reservation, the United States military authorities shall have the power, within the limits of such reservations, to police such roads and highways, to regulate traffic thereon, and to exercise such supervisory powers over such roads and highways as they may deem necessary to protect life and property on such military reservations.