The Superintendent of Public Works shall install and maintain
traffic control devices when and as required under the provisions
of this chapter to make effective the provisions of this chapter and
may install and maintain such additional traffic control devices as
the Board of Trustees may deem necessary to regulate, warn or guide
traffic under the Vehicle and Traffic Law of the State of New York,
subject to the provisions of §§ 1682 and 1684 of that
law.