Section 151-A. Tractor

Latest version.

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.

                    
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