Except temporarily for the purpose of, and while actually engaged in, loading or unloading passengers or for emergency repairs when the vehicle cannot be driven, no person shall park any vehicle on a public parking facility: In violation of any of the other parking provisions of this Subtitle; In a "no parking zone" when posted by sign or indicated by yellow painted curb or yellow painted lines on the parking surface; Any place not otherwise designated by painted parking spaces or otherwise prohibited, including driving aisles, driveways, raised curb channelization structures, sidewalks, landscaped areas, islands, etc.; In an area where parking is temporarily prohibited when marked off by temporary signs or barricades or when an official cover or hood is placed over a parking meter; So as to prevent another vehicle already stopped or otherwise legally parked in a designated parking space, from moving away; For a period longer than twenty-four hours; By backing said vehicle into a parking space when posted by "Front In Only" signs; In such a manner as to cause said vehicle to straddle the painted lines marking a parking space or otherwise cause the vehicle to be parked not wholly within the area of one designated parking space; And leave it unattended without first stopping the engine, locking the ignition, removing the key, and effectively setting the brake thereon; or In such a manner so as to impede or obstruct the free flow of traffic or to cause a hazard to public safety. Penalty. Any person issued a citation for a violation of this Section shall be subject to a fine of Thirty-Five Dollars ($35.00) for each violation. Penalty. Notwithstanding subsection (b), any person issued a citation for a violation of parking for a period longer than twenty-four hours pursuant to subsection (a)(6) of this Section shall be subject to a fine of Fifty Dollars ($50.00).