The Board of Trustees, upon recommendation by
the Chief of Police, 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 it 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.