RCW 46.20.001: License required—Rights and restriction.

(1) No person may drive a motor vehicle upon a highway in this state without first obtaining a valid driver's license issued to Washington residents under this chapter. The only exceptions to this requirement are those expressly allowed by RCW 46.20.025 . (2) A person licensed as a driver under this chapter: (a) May exercise the privilege upon all highways in this state; (b) May not be required by a political subdivision to obtain any other license to exercise the privilege; and (c) May not have more than one valid driver's license at any time.