No person shall cause a truck or other vehicle while being used for commercial purposes to enter upon, use, or traverse any portion of any state park area or any park road therein except in the service of the commission at the request of an employee or concessionaire of the commission, or by express permission of the director for a special activity not inconsistent with state park use: Provided, That the provisions of this section shall not apply to county roads or state highways.

Any vehicle in violation of this section may be towed away at the owner's or operator's expense. Except as provided in WAC 352-20-070, any violation of this section is an infraction under chapter 7.84 RCW.