The governing body of any county or city may by ordinance make it unlawful for any person to transport, possess or carry a loaded shotgun or loaded rifle in any vehicle on any public street, road, or highway within such locality. Any violation of such ordinance shall be punishable by a fine of not more than $100. Conservation police officers, sheriffs and all other law-enforcement officers shall enforce the provisions of this section. No ordinance adopted pursuant to this section shall be enforceable unless the governing body adopting such ordinance so notifies the Director of the Department of Wildlife Resources by registered mail prior to May 1 of the year in which such ordinance is to take effect. The provisions of this section shall not apply to duly authorized law-enforcement officers or military personnel in the performance of their lawful duties, nor to any person who reasonably believes that a loaded rifle or shotgun is necessary for his personal safety in the course of his employment or business.