625 ILCS 5/1-111.1a

(a) Any vehicle that is exclusively owned and operated by a religious or charitable not-for-profit organization and is used primarily in conducting the official activities of such organization. (b) This definition does not include: (1) a bus operated by a public utility, municipal corporation or common carrier authorized to conduct local or interurban transportation of passengers when such bus is on a regularly scheduled route for the transportation of other fare paying passengers or furnishing charter service for the transportation of groups on special trips or in connection with special events and not over a regular or customary religious organization bus route; (2) a school bus as defined in Section 1-182 of this Code; or (3) a First Division vehicle, other than one designed for transporting not less than 7 nor more than 10 passengers, as defined in Section 1-217 of this Code; except that for purposes of determining the number of persons a vehicle is designed to carry in this Section, in any vehicle equipped with one or more wheelchair tiedowns, each wheelchair tiedown shall be counted as 4 persons. Each wheelchair tiedown shall be counted as 1 person for any other purpose of this Code.