N.J. Stat. § 32:3-10
The commonwealth of Pennsylvania and the state of New Jersey hereby covenant and agree with each other and with the holders of any bonds or other securities or obligations of the commission for which there may or shall be pledged the tolls, rents, rates or other revenues, or any part thereof, of any property or facility owned, operated or controlled by the commission (including the said bridge across the Delaware river and the facilities for the transportation of passengers across the said bridge) that (so long as any of said bonds or other securities or obligations remain outstanding and unpaid, and unless and until adequate provision is made by law for the protection of those advancing money upon such obligations) the commonwealth and the said state will not diminish or impair the power of the commission to own, operate or control said properties and facilities or to establish, levy and collect tolls, rents, rates and other charges in connection with such properties or facilities.
The commonwealth of Pennsylvania and the state of New Jersey hereby covenant and agree with each other and with the holders of any bonds or other securities or obligations of the commission for which the tolls, rents, rates or other revenues, or any part thereof, of the aforesaid existing bridge across the Delaware river shall have been pledged, that the said commonwealth and the said state will not authorize or permit the authorization of the construction, operation or maintenance of any additional vehicular bridge or tunnel, or any additional bridge or tunnel having railroad or other facilities for the transportation of passengers, between the said commonwealth and the said state, over or under the Delaware river, by any other person or body than the commission, within a distance of ten miles in either direction from the said bridge, measured along the boundary line between the said commonwealth and the said state.
N.J.S. § 32:3-10