Maryland Transportation Section 21-1205.1
(a)   Notwithstanding any other provision of this title, a person may not ride a bicycle or a motor scooter:
(1)   On any roadway where the posted maximum speed limit is more than 50 miles an hour; or
(2)   On any expressway, except on an adjacent bicycle path or way approved by the State Highway Administration, or on any other controlled access highway signed in accordance with § 21-313 of this title.
(b)   (1)   Where there is a bike lane paved to a smooth surface or a shoulder paved to a smooth surface, a person operating a bicycle or a motor scooter shall use the bike lane or shoulder and may not ride on the roadway, except in the following situations:
(i)   When overtaking and passing another bicycle, motor scooter, pedestrian, or other vehicle within the bike lane or shoulder if the overtaking and passing cannot be done safely within the bike lane or shoulder;
(ii)   When preparing for a left turn at an intersection or into an alley, private road, or driveway;
(iii)   When reasonably necessary to leave the bike lane or shoulder to avoid debris or other hazardous condition; or
(iv)   When reasonably necessary to leave the bike lane or shoulder because the bike lane or shoulder is overlaid with a right turn lane, merge lane, or other marking that breaks the continuity of the bike lane or shoulder.
(2)   A person operating a bicycle or a motor scooter may not leave a bike lane or shoulder until the movement can be made with reasonable safety and then only after giving an appropriate signal.
(3)   The Department shall promulgate rules and regulations pertaining to this subsection which will include, but not be limited to, a definition of "smooth surface".
(c)   A motor scooter may not be operated at a speed in excess of 30 miles per hour.
(d)   Notwithstanding any other provision of this title, a person may not operate an EPAMD on any roadway where there are sidewalks adjacent to the roadway or the posted maximum speed limit is more than 30 miles an hour.
(e)   An EPAMD may not be operated at a speed in excess of 15 miles per hour.