Maryland Transportation Section 11-159

      (a)      "Special mobile equipment" means, except as provided in subsection (c) of this section, a vehicle that:

            (1)      Is not used primarily for highway transportation of people or property; and

            (2)      Is operated or moved on a highway only as an incident to its nonhighway use.

      (b)      "Special mobile equipment" includes a road construction or maintenance machine, mobile crane, ditchdigger, well driller, concrete mixer, jobsite office vehicle, or portable power generator.

      (c)      "Special mobile equipment" does not include a farm tractor or any farm equipment.