“Truck tractor” means the noncargo carrying power unit that operates in combination with a semitrailer or trailer, except that a truck tractor and semitrailer engaged in the transportation of automobiles or boats may transport motor vehicles or boats on part of the power unit.
Md. Code Ann., Transp. § 11-172
Official source: Maryland General Assembly. Reproduced from public-domain Maryland statutes; confirm against the official source for the current text. Not legal advice.