The Board of Trustees or its designee 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.