Staff (2011). "2011 Annual Traffic Report"(PDF). Washington State Department of Transportation. pp. 105, 164–165. Archived from the original(PDF) on June 13, 2013. Retrieved February 25, 2013.
Staff (2011). "2011 Annual Traffic Report"(PDF). Washington State Department of Transportation. pp. 105, 164–165. Archived from the original(PDF) on June 13, 2013. Retrieved February 25, 2013.