Md. Code, Transportation § 11–148

(a) “Regular schedule” means the carriage of property or passengers by at least:

(1) One single trip between fixed termini per week, for 4 consecutive weeks; or

(2) Three single trips between fixed termini within a period of 10 days.

(b) If property or passengers are carried by any vehicle as described in subsection (a) of this section, any one of the described trips is a regular schedule.

(c) This section shall be liberally construed.