The Board of Trustees shall provide for the
installation and maintenance of 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.