Maryland Transportation Section 21-308

      (a)      (1)      The State Highway Administration may designate any highway or any separate roadway under its jurisdiction for one-way traffic and shall place appropriate signs giving notice of the designation.

            (2)      On a roadway designated and signposted for one-way traffic, a vehicle may be driven only in the direction designated.

      (b)      A vehicle passing around a rotary traffic island may be driven only to the right of the island.