RCW 47.32.110: Merchandising structures—Permit—Removal.

It is unlawful for any person to build, erect, establish, operate, maintain, or conduct along and upon the right-of-way of any state highway any platform, box, stand, or any other temporary or permanent device or structure used or to be used for the purpose of receiving, vending, or delivering any milk, milk cans, vegetables, fruits, merchandise, produce, or any other thing or commodity of any nature unless a permit therefor has first been obtained from the department. The department shall in each instance determine where any platform, box, stand, or any other temporary or permanent device or structure shall be permitted. Upon the existence of any such device or structure without a permit having been first obtained, it shall be considered an obstruction unlawfully upon the right-of-way of the state highway, and the department may proceed to effect its removal.