The Superintendent of Public Works shall install
and maintain traffic control devices when and as required under the
provisions of this chapter, as the same may be amended from time to
time to make effective the provisions of this chapter, and may install
and maintain such additional traffic control devices as he 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.