N.J. Stat. § App.A:4-42
Whenever pursuant to the provisions of the act to which this is a supplement, and/or to any acts amendatory thereto, and/or to the provisions of any municipal charter, and/or to any other acts relative thereto, any municipality shall heretofore have opened, widened and/or improved any street, and/or incurred an expense in connection therewith, the assessments to pay for which may be paid in annual installments over a period of years, and which said assessments are not yet fully paid, the payment of all said unpaid annual installments may be deferred and extended for a period of two years from the time when said annual installments come due or may have become due; provided, however, that interest on said annual installments shall be paid as heretofore.
N.J.S. § App.A:4-42