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.