Idaho Code § 67-7108: Prohibition against numbering by political subdivisions.

The provisions of this chapter shall govern the numbering and registration of snowmobiles, all-terrain vehicles, motorbikes, specialty off-highway vehicles and utility type vehicles operated in this state. All political subdivisions of the state are expressly prohibited from numbering or registering snowmobiles, all-terrain vehicles, motorbikes, specialty off-highway vehicles and utility type vehicles in any respect.