New Jersey Statutes Title 27. Highways 27 § 10-1

The governing body of a municipality in which a state highway route has or shall have been laid out may, with the consent of the commissioner, construct and improve any part of the highway within the municipality. The work shall be in accordance with plans and specifications submitted by the governing body and approved by the commissioner, and shall be conducted by the governing body at all times subject to the inspection of the commissioner.

No contract for the construction or improvement of a highway made by a municipality under the provisions of this chapter shall be effective until approved by the commissioner, both as to character of work and materials.

The contract shall provide that no payment shall be made thereunder to a contractor except on the certificate of the municipal engineer, countersigned by the state highway engineer, certifying that the work for which payment is claimed has been done in all respects in accordance with the contract, plans and specifications.