Md. TRANSPORTATION Code Ann. § 21-308 (2020)

§ 21-308. One-way highways and roadways

(a)  One-way highways and roadways. —

(1)  The State Highway Administration may designate any highway or any separate roadway under its jurisdiction for one-way traffic and shall place appropriate signs giving notice of the designation.

(2)  On a roadway designated and signposted for one-way traffic, a vehicle may be driven only in the direction designated.

(b)  Rotary traffic islands. —  A vehicle passing around a rotary traffic island may be driven only to the right of the island.