Maryland Code, Transportation § 8-807

(a) The Administration may not issue a license under this subtitle for the establishment, operation, or maintenance of any new junkyard, automotive dismantler and recycler facility, or scrap metal processing facility or for the expansion of any existing junkyard, automotive dismantler and recycler facility, or scrap metal processing 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, unless the junkyard or facility is:

(b) This section does not permit the Administration to preempt any zoning act or ordinance of any political subdivision. If a political subdivision later zones any area for a use that conflicts with a determination of the Administration, the determination of the Administration is void.