(1) Whenever the city manager or the manager’s designee finds, on the basis of falling snow, sleet, freezing rain, formation of ice, or on the basis of a forecast by the U. S. Weather Bureau of snow, sleet or freezing rain, that weather conditions will make it necessary that streets be sanded and that parking on city streets be prohibited or restricted for snow plowing and other purposes, the city manager or the manager’s designee may put into effect a parking prohibition on all or parts of priority one routes and priority two routes as necessary by declaring it in the manner prescribed by section 5.681 of this code.

(2) Notwithstanding the provisions of section (1) of this section, a parking prohibition shall automatically go into effect on any part of any priority one or priority two route on which there has been an accumulation of one inch or more of snow or an accumulation of ice on the road surface.

(3) Once in effect, a prohibition under this section shall remain in effect until terminated by announcement of the city manager or the manager’s designee in accordance with section 5.682 of this code. While the prohibition is in effect, no person shall park or allow to remain parked any vehicle on any portion of a priority one or priority two route to which it applies. However, nothing in this section shall be construed to permit parking at any time or place where it is forbidden by any other provision of law.