The commission is hereby vested with power and authority, and it is hereby made its duty, to prescribe rules and regulations covering the operations of contract carriers by motor vehicles in competition with common carriers of this state, and the commission shall prescribe minimum rates, fares, and charges to be collected by such contract carriers by motor vehicle, which shall not be less than the rates prescribed for common carriers by motor vehicles for substantially the same service.
W. Va. Code § 24A-3-6