The department may issue permits for the passage of vehicles on any or all of its toll bridges, toll tunnels, toll roads, or for the Washington state ferry system on a credit basis upon such terms and conditions as the department deems proper.

Severability—1961 c 258: "If any provision of this act, or its application to any person or circumstance is held invalid, the remainder of the act, or the application of the provision to other persons or circumstances is not affected." [ 1961 c 258 § 3.]