Washington Revised Code Title 46. Motor Vehicles § 46.61.380. Rules for design, marking, and mode of operating school buses

(1) The state superintendent of public instruction shall adopt and enforce rules not inconsistent with the law of this state to govern the design, marking, and mode of operation of all school buses owned and operated by any school district or privately owned and operated under contract or otherwise with any school district in this state for the transportation of school children.

(2) School districts shall not be prohibited from placing or displaying a flag of the United States on a school bus when it does not interfere with the vehicle's safe operation. The state superintendent of public instruction shall adopt and enforce rules not inconsistent with the law of this state to govern the size, placement, and display of the flag of the United States on all school buses referenced in subsection (1) of this section.

(3) Rules shall by reference be made a part of any such contract or other agreement with the school district. Every school district, its officers and employees, and every person employed under contract or otherwise by a school district is subject to such rules. It is unlawful for any officer or employee of any school district or for any person operating any school bus under contract with any school district to violate any of the provisions of such rules.