(1) The Department shall erect and maintain appropriate signs to give notice whenever an ordinance or regulation prohibits stopping, standing and parking on any street, or portion thereof, and no person shall stop, stand or park a vehicle in violation of such ordinances or regulations.

(2) The Department shall erect and maintain appropriate signs to give notice whenever an ordinance or regulation prohibits standing and parking on any street, or portion thereof, and no person shall stand or park a vehicle in violation of such ordinances or regulations.

(3) The Department shall erect and maintain appropriate signs to give notice whenever an ordinance or regulation prohibits parking or limits the time of parking on any street, or portion thereof, and no person shall park a vehicle in violation of such ordinances or regulations.

(4) Ordinances or regulations imposing a time limit on parking shall not relieve any operator from obeying more restrictive regulations prohibiting stopping, standing or parking.

(5) In areas expressly provided for by special ordinances, the Department may establish and revise limited time parking regulations, as prescribed in Section 12-903(3).^[22]

(6) The Department is authorized to establish by regulation cleaning zones in which stopping, standing or parking is prohibited at certain times on a certain day or days of the week for the purpose of permitting street cleaning. Any such zone established by the Department is hereby designated as a towing zone for the hours during which the Department has by regulation prohibited stopping, standing or parking. The Department shall clearly designate by appropriate signs the day or days of the week and the hours during which stopping, standing or parking is prohibited in such zones, and the fact that they are towing zones. Violations of the regulations promulgated pursuant to this subsection 12-903(4) shall be enforced in the manner set forth in § 12-916.^[23]