New York Laws
Article 37 - Regulation of Traffic by Department of Transportation and Other State Authorities
1621 - Other Traffic Regulations on State Highways and on Indian Reservations.

(b) The department of transportation shall cause to be determined, for
all bridges and elevated structures under its jurisdiction, the capacity
in tons of two thousand pounds which the bridge or structures will
safely carry. At bridges or structures of insufficient strength to carry
safely the legal loads permissible by section three hundred eighty-five
of this chapter, the department of transportation shall cause signs to
be erected to inform persons of the safe capacity.
(c) Such department of transportation shall cause signs to be erected
to inform persons of the legal overhead clearance for all bridges and
elevated structures on highways under its jurisdiction. The legal
clearance shall be one foot less than the measured clearance. The
measured clearance shall be the minimum height to the bridge or
structure measured vertically from the traveled portion of the roadway.
On bridges or structures having fourteen feet or more of measured
clearance, no such signs shall be required.
(d) The department of transportation may by order, rule or regulation
temporarily exclude from any portion of any state highway and any
highway and bridge constructed or to be constructed by the state on any
indian reservation any vehicle with a gross weight of over four or more
tons or any vehicle with a gross weight in excess of any designated
weight on any wheel, axle, any number of axles, or per inch width of
tire when in its opinion such highway would be materially injured by the
operation of any such vehicle thereon. Such exclusion shall take effect
upon the erection of signs on the section of highway from which vehicles
are excluded, and a notice that such vehicles are excluded shall be
published in a newspaper in the county where the highway is situated.
The exclusion shall remain in effect until the removal of the signs is
directed by the department of transportation.