D.__If the main traveled portion of a public way is publicly plowed and utilized by conventional motor vehicles, a snowmobile may be operated only on that portion of the way not maintained or utilized for the operation of conventional motor vehicles, except that operation on the left side of the way is prohibited during the hours from sunset to sunrise on the portion of the way not maintained or utilized for the operation of conventional motor vehicles. This paragraph does not apply to a snowmobile operated by a public utility regulated by the Public Utilities Commission while being operated in the course of the utility's corporate function, so that public utilities may effectively and speedily carry out their obligations to the public;

E.__A snowmobile may be operated on streets and public ways during a period of emergency when the emergency has been so declared by a police agency having jurisdiction and when travel by conventional motor vehicles is not practicable. This paragraph does not apply to a snowmobile operated by a public utility regulated by the Public Utilities Commission while being operated in the course of the utility's corporate function, so that public utilities may effectively and speedily carry out their obligations to the public;

F.__A snowmobile may be operated on streets and public ways in special snowmobile events of limited duration conducted according to a prearranged schedule and under a permit from the governmental unit having jurisdiction; and

G.__Notwithstanding paragraphs A to F, a snowmobile may be operated on the extreme right of a public way within the built-up portion of a municipality, unorganized or unincorporated township if the appropriate governmental unit has designated the public way as a snowmobile-access route for the purpose of allowing snowmobiles access to places of business.__A public way designated by an appropriate governmental unit as a snowmobile-access route must be posted conspicuously at regular intervals by that governmental unit with highly visible signs designating the snowmobile-access route.__Before designating a public way as a snowmobile-access route, the appropriate governmental unit shall make appropriate determinations that snowmobile travel on the extreme right of the public way may be conducted safely and will not interfere with vehicular traffic on the public way.__For purposes of this paragraph, "appropriate governmental unit" means the Department of Transportation,