Maryland Code, Transportation § 21-307

(a)(1) The State Highway Administration may determine those parts of any highway in its jurisdiction where overtaking and passing or driving on the left of the roadway would be especially dangerous and, by appropriate signs or markings on the roadway, may indicate the beginning and end of these zones.

(2) Except as provided in subsection (d) of this section, where the signs or markings are in place and clearly visible to an ordinarily observant individual, every driver of a vehicle shall obey their directions.

(1) Across the left side of the roadway in a no-passing zone while making a left turn, but only if it is safe to do so; and

(2) In accordance with § 21-305 of this subtitle, on the left side of the roadway in a no-passing zone to make the minimum adjustment necessary to overtake and pass at a safe distance a bicycle traveling in the same direction while yielding to the right-of-way of the bicycle and oncoming traffic.