(a) A person may not use a slow-moving-vehicle emblem on a stationary object or a vehicle other than a slow-moving vehicle.
(b) A person may not operate a motor vehicle bearing the words "school bus" unless the vehicle is used primarily to transport persons to or from school or a school-related activity. In this subsection, "school" means a privately or publicly supported elementary or secondary school, day-care center, preschool, or institution of higher education and includes a church if the church is engaged in providing formal education.