Maryland Code, Transportation § 21-104.1

(a) In this section, “all-terrain vehicle” includes an off-highway motorcycle.

(b) Any person operating an all-terrain vehicle or a snowmobile on any portion of a highway designated for all-terrain vehicle or snowmobile use under § 25-102(a)(14) of this article has all the rights granted to and is subject to all the duties required of the driver of a vehicle by this title, except for those provisions of this title that by their very nature cannot apply.

(c) In Allegany County and Garrett County a person may not operate an all-terrain vehicle or a snowmobile on a controlled access highway.

(d) Except as provided in subsection (c) of this section, in Allegany County and Garrett County a person may operate an all-terrain vehicle or a snowmobile on a State highway when crossing or traveling on the State highway in accordance with § 25-102(a)(14) of this article.