Maryland Code, Transportation § 8-725

(i) Outdoor advertising;

(ii) Agricultural, forestry, ranching, grazing, farming, and related activities, including wayside fresh produce stands;

(iii) Activities normally or regularly in operation less than 3 months of the year;

(iv) Transient or temporary activities;

(v) Activities conducted in a building principally used as a residence; and

(vi) Railroad tracks and minor sidings.

(i) That is reserved under a local zoning ordinance or regulation for business, commerce, or trade;

(ii) That is not zoned and on which there are located one or more permanent structures devoted to a commercial or industrial activity or on which a commercial or industrial activity is conducted, whether or not a permanent structure is located there, including the area that, along or parallel to the edge or pavement of that side of the highway, extends 660 feet from the outer edges of the regularly used buildings, parking lots, or storage or processing areas of the commercial or industrial activity.