Md. Code, Transportation § 25–102.1

(a) (1) In this section, “off-the-road motorcycle” means a motorcycle not otherwise registered under this article.

(2) “Off-the-road motorcycle” includes motorcycles designed for off-the-road operation, motorcycles not otherwise eligible for registration under this article, and motorcycles commonly referred to as “dirt bikes”.

(b) Each county and Baltimore City may regulate the operation of off-the-road motorcycles, require them to be registered, and impose a registration fee for them.