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.