(a) a camper or canopy shall place or allow it to be placed within a public street right-of-way for any period of time, unless the camper or canopy is mounted on a motorized vehicle intended for the usual use of the camper or canopy.

(b) a vehicle shall store it within a public street right-of-way. This prohibition shall not be construed as granting permission for a vehicle to remain in a public street right-of-way after the Director of Public Works has determined and notice has been given that its removal is necessary in order to make improvements, or perform repairs, or perform maintenance including street cleaning and snow removal within the public street right-of-way, or if a member of the Police Department determines that it is obstructing traffic.