A.
The provisions of this Article shall apply except when it is necessary to stop a vehicle to avoid conflict with other traffic or to comply with the directions of a police officer, fireman, school crossing guard or official traffic control device.
B.
The provisions of this Article shall not apply to the driver of any vehicle that is disabled while on the traveled portion of any public street in such manner and to such extent that it is impossible to avoid stopping and temporarily leaving such disabled vehicle in a position otherwise prohibited.