N.J. Stat. § 48:12-76
In connection with the elimination of any crossing at grade, the improvement, relocation, alteration or reconstruction of any crossing not at grade, or the location and construction of any new crossing not at grade under sections 48:12-68 to 48:12-75 of this Title, the Board of Public Utility Commissioners on petition of the State Highway Department or of any railroad company affected or of any party in interest may close, abandon or combine any railroad crossing or crossings at grade of any State, county or municipal highway or highways, when the board shall determine that the public safety so requires or public convenience so permits and that by reason of said State highway construction or improvement the crossing is or the crossings are no longer necessary.
N.J.S. § 48:12-76