Where any highway or bridge required to be maintained in repair by any municipality is damaged by the operation thereon of equipment used in the construction of any state highway, or portion thereof, which construction is under the control of the commissioner, said commissioner, with the approval of the Attorney General, may agree with such municipality as to the cost of repairing such damage, and, upon such agreement being made, the sum agreed upon therein shall, upon the filing of such agreement with the Comptroller, be paid by the state to such municipality out of the appropriation of the commissioner for the repair of highways. If such municipality and the commissioner are unable to reach such an agreement, the municipality may commence an action against the commissioner in the superior court for the judicial district wherein the municipality is located to recover the cost of such repairs. Such action shall be tried to the court and the amount of the judgment rendered therein shall, upon the filing with the Comptroller of a certified copy of such judgment, be paid by the state out of the appropriation of the commissioner for repair of highways, but no costs or judgment fee in any such action shall be taxed against the commissioner. The commissioner, with the approval of the Attorney General and the consent of the court before which any such action may be pending, may make an offer of judgment in settlement thereof. No such agreement shall be entered into and no such action shall be commenced except within six months after such state highway, or portion thereof concerned, has been opened for general traffic, unless within such six-month period the commissioner, in writing, extends such period for not more than an additional six months. This section shall not be construed so as to relieve any contractor or other person, through whose neglect or default any such damage may have occurred, from liability to the state, and, upon payment by the Comptroller of any judgment rendered under the provisions of this section, or of any amount agreed on as provided herein, the state shall be subrogated to the rights of such municipality to recover from such contractor or other person an amount equal to the amount it has so paid. Prior to the commencement of any such construction activity, the commissioner and the executive authority of any municipality, the highways and bridges of which may be utilized during such construction, or their appointed agents, shall jointly inspect such highways and bridges and a report of such inspection signed by authorized agents of the municipality and the commissioner indicating the condition of such highways and bridges shall be filed in the offices of the clerk of the municipality and of the commissioner.