Maryland Statutes
Part IX - Miscellaneous Provisions
Section 8-648 - Storm Drain Covers in Highways

Any new or replacement storm drain cover, installed on a street or highway in the State, after January 1, 1980, shall consist of:
        (1)    Bars running perpendicular to the flow of traffic on the highway;
        (2)    A grating composed of intersecting bars; or
        (3)    Other designs approved by the Department of Transportation which meet safety design criteria as well as engineering and structural design demands.