Maryland Code, Transportation § 6-406

(1) To avoid duplication of effort by the Administration and Baltimore City, to the extent that they have coextensive authority in matters relating to harbors, docks, wharves, and port development; and

(2) To assure the uninterrupted continuation of needed services.

(c)(1) If, by agreement made under § 6-407 of this subtitle, Baltimore City transfers to the Administration any duty, only the Administration may perform that duty.

(2) Any ordinance or regulation that was adopted before June 1, 1959, by the Mayor and City Council of Baltimore and that relates to any authority transferred to the Administration by agreement made under § 6-407 of this subtitle:

(3) Only the Administration may readopt, amend, or repeal these ordinances or regulations.