(1) "Passenger motor vehicle" means any sedan, station wagon, bus, or light truck which is designed for carrying ten passengers or less and is used primarily for the transportation of persons;
(2) "State agency" shall include any state office, agency, commission, department, or institution financed in whole or in part from funds appropriated by the legislature. It shall also include the Washington state school directors' association, but it shall not include (a) the state supreme court or any agency of the judicial branch or (b) the legislature or any of its statutory, standing, special, or interim committees, other than at the option of the judicial or legislative agency or committee concerned;
(3) "Employee commuting" shall mean travel by a state officer or employee to or from his or her official residence or other domicile to or from his or her official duty station or other place of work;
(4) "Motor vehicle transportation services" shall include but not be limited to the furnishing of motor vehicles for the transportation of persons or property, with or without drivers, and may also include furnishing of maintenance, storage, and other support services to state agencies for the conduct of official state business.