N.J. Stat. Ann. § 27:5G-14

Any county or municipality having jurisdiction over a highway carried by a railroad overhead bridge assigned to the jurisdiction of the New Jersey Transit Corporation under section 7 of this act or to the jurisdiction of the department under section 9 of this act shall have responsibility for routine maintenance of the surface roadway carried by the bridge, including but not limited to snow removal, sidewalk and guiderail repair, lighting, striping, signing, patching, and resurfacing. These routine maintenance responsibilities shall be accomplished under the regulations which may be adopted by the commissioner or the Board of the New Jersey Transit Corporation or agreements entered into by the department or the corporation, as appropriate. Routine maintenance responsibilities of a county or municipality shall not extend to the structural support components of any railroad overhead bridge under the jurisdiction of the department or the New Jersey Transit Corporation.