Okla. Stat. tit. 47, § 47-1-160: School bus

Every motor vehicle owned by a public or governmental agency and

operated for the transportation of children to or from school or

privately owned and operated for compensation for the transportation

of children to or from school, provided, however, that this

definition of school bus shall not be extended to include buses

normally used in city transit which may be used part time for

transportation of school children within such cities during some

portion of the day.