Here is Maryland law...
§ 21-1205.
(a) Each person operating a bicycle or a motor scooter at a speed less than the speed of traffic at the time and place and under the conditions then existing on a roadway shall ride as near to the right side of the roadway as practicable and safe, except when:
(1) Making or attempting to make a left turn;
(2) Operating on a one-way street;
(3) Passing a stopped or slower moving vehicle;
(4) Avoiding pedestrians or road hazards;
(5) The right lane is a right turn only lane; or
(6) Operating in a lane that is too narrow for a bicycle or motor scooter and another vehicle to travel safely side by side within the lane.
(b) Each person operating a bicycle or a motor scooter on a roadway may ride two abreast only if the flow of traffic is unimpeded.
(c) Each person operating a bicycle or a motor scooter on a roadway shall exercise due care when passing a vehicle.
(d) Each person operating a bicycle or a motor scooter on a roadway may walk the bicycle or motor scooter on the right side of a highway if there is no sidewalk.
§ 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.
I have lots of questions on this, but one is... Is a sidewalk considered a bike lane? And if so... it is illegal under MD law, with certain exeptions defined above, to ride in the road when there is a sidewalk present. News to me. That will change my ride each day.