N.Y. Vehicle & Traffic Law § 151-a: Tractor

§ 151-a. Tractor. A motor vehicle designed and used as the power unit

in combination with a semitrailer or trailer, or two such trailers in

tandem. Any such motor vehicle shall not carry cargo except that a

tractor and semitrailer engaged in the transportation of automobiles may

transport motor vehicles on part of the power unit.