Maryland Code, TRANSPORTATION 11-140.1
(1) A motor-assisted or motor-driven vehicle that:
(i) Is designed to carry only the operator of the vehicle on a seat or saddle designed to be straddled by the operator or is designed to carry only the operator of the vehicle and one passenger; and
(ii) Is commonly known as an all-terrain vehicle;
(2) A motor-assisted or motor-driven vehicle that:
(i) Travels on four or more tires;
(ii) Is intended for use by one or more persons;
(iii) Has the following features:
1. A steering wheel for steering control;
2. A roll-over protective structure;
3. An occupant retention system;
4. Nonstraddle seating;
5. A maximum speed capability exceeding 30 miles per hour;
6. An overall width of less than 80 inches, exclusive of accessories; and
7. An engine displacement of less than 1,000 cubic centimeters; and
(iv) Is commonly known as a side-by-side utility vehicle;
(3) A motorcycle that is designed for off-highway operation and is not eligible for registration as a Class D (motorcycle) vehicle under this article, commonly known as a dirt bike; or
(4) A snowmobile.
(b) “Off-highway recreational vehicle” does not include:
(1) A farm vehicle as defined in § 13-911 of this article when used exclusively on farm property by a farmer;
(2) Any vehicle when used on residential property for the purpose of landscaping, gardening, or lawn care; or
(3) An electric bicycle.
(c) The Administration may establish by regulation other requirements for or limitations on the definition of “off-highway recreational vehicle”.