The official mailing address of the board is:
Transportation Improvement Board
Post Office Box 40901
Olympia, Washington 98504-0901.
Wash. Admin. Code § 479-01-030
Statutory Authority: Chapter 47.26 RCW. 07-18-050, § 479-01-030, filed 8/30/07, effective 9/30/07; 95-04-072, § 479-01-030, filed 1/30/95, effective 3/2/95; 90-11-035, § 479-01-030, filed 5/10/90, effective 6/10/90; 83-22-021 (Order 83-01, Resolution Nos. 770, 771 and 772), § 479-01-030, filed 10/26/83; Order 281, § 479-01-030, filed 5/21/73; Order 31 (part), § 479-01-030, filed 11/8/67.