Maryland Code, TRANSPORTATION 22-211
(b) Reflectors required to be mounted on the sides of the vehicle shall reflect the required color of light to the sides, and those mounted on the rear shall reflect a red color to the rear.
(c) Front and rear clearance lamps and identification lamps shall be capable of being seen and distinguished under normal atmospheric conditions, at the times lights are required, at all distances between 500 and 50 feet from the front and rear, respectively, of the vehicle.
(d) Side marker lamps shall be capable of being seen and distinguished under normal atmospheric conditions, at the times lights are required, at all distances between 500 and 50 feet from the side of the vehicle on which they are mounted.