N.J. Stat. Ann. § 39:4-120.2

Subject to the provisions of R.S. 39:4-8 and P.L.1969, c. 65 (C. 27:1A-43 et seq.), a municipality may determine the operation of any approved traffic control device as a flashing mechanism on municipally-owned and maintained streets and roads during the offpeak hours between 10 p.m. to 6 a.m. of any day of the week.