Maryland Code, Transportation § 8-803

(a) A person may not establish, operate, or maintain any new junkyard , automotive dismantler and recycler facility, or scrap metal processing facility or expand the area of any existing junkyard or automotive dismantler and recycler facility, if any part of the junkyard or facility is within 1,000 feet of the nearest edge of the right-of-way of any interstate or primary highway and is visible from the main traveled way of that highway, unless the person is licensed by the Administration under this subtitle.

(b) This section does not apply to any junkyard or facility that was in existence on or before January 1, 1968, unless the area of its operation is expanded.