No more than three persons including the operator shall ride or be permitted by such operator to ride in the seat with the operator of any motor vehicle while such motor vehicle is being operated on the streets or highways of the municipality; provided, however, that, the limitation of this section shall not apply to a truck cab or truck crew compartment properly designed for the occupancy of four persons including the operator, and so designated on the registration card by the Department of Motor Vehicles.
(W.Va. Code § 17C-14-5)