W. Va. Code § 11-14A-8: Exemptions.

Nothing in this article shall apply to any motor carrier operated or caused to be operated by or on behalf of any department, board, bureau, commission or other agency of the federal government or of this or any other state or any political subdivision thereof, nor shall the provisions of this article apply to any school bus operated or caused to be operated by or on behalf of this state or any political subdivision thereof or any private or privately operated school or schools.