Md. Code, Tax - General § 9–221

The Comptroller may issue a temporary authorization to a motor carrier to operate a commercial motor vehicle in the State if the Comptroller is satisfied that:

(1) the motor carrier does not have an identification marker or trip permit for the commercial motor vehicle;

(2) unforeseen circumstances require operation of the commercial motor vehicle; and

(3) a prohibition of operation would cause undue hardship.