(a) Upon any street or highway outside of a business or residence district no person shall stop, park or leave standing any vehicle, whether attended or unattended, upon the paved or main-traveled part of the street or highway when it is practicable to stop, park or so leave such vehicle off such part of the street or highway, but in every event an unobstructed width of the street or highway opposite a standing vehicle shall be left for the free passage of other vehicles and a clear view of such stopped vehicles shall be available from a distance of 200 feet in each direction upon such highway or street.
(b) This section shall not apply to the driver of any vehicle which is disabled while on the paved or main-traveled portion of a street or highway in such a manner and to such extent that it is impossible to avoid stopping and temporarily leaving such disabled vehicle in such position.