<ref name="RCW">{{cite web |url=http://apps.leg.wa.gov/RCW/default.aspx?cite=47.17. |title=47.17.: State route No. |year=19 |work=[[Revised Code of Washington]] |publisher=[[Washington State Legislature]] |accessdate=}}</ref>
<ref name="wsdot-bridgelist">{{cite web |author=Staff |title=Bridge List M23-9.05 |date=October 2011 |url=http://www.wsdot.wa.gov/publications/manuals/fulltext/m23-09/m23-09.05complete.pdf |format=PDF |pages= |publisher=Washington State Department of Transportation |accessdate=}}</ref>
<ref name="sr">{{cite web |last=Prahl |first=C. G. |date=December 1, 1965 |title=Identification of State Highways |url=https://www.wsdot.wa.gov/sites/default/files/2005/04/26/Identification-of-state-highways.pdf |publisher=[[Washington State Highway Commission]], [[Department of Highways (Washington)|Department of Highways]] |accessdate=}}</ref>
<ref name="nrhp-">{{cite web |date=March 1, 1983 |title=National Register of Historic Places; Annual Listing of Historic Properties |publisher=United States Department of the Interior, National Park Service |url= |page= |format=PDF |accessdate=}}</ref>
<ref>{{cite book |editor-last= |editor-first= |date= |chapter= |title=Session Laws of the State of Washington |url= |format=PDF |series=Session Laws of the State of Washington |edition= |location=Olympia, Washington |publisher=Washington State Legislature |page= |pages= |oclc=42336168 |accessdate= |quote=}}</ref>
<ref name="HSS-list">{{cite web |title=Transportation Commission List of Highways of Statewide Significance |url=https://www.wsdot.wa.gov/sites/default/files/2006/03/16/HSSlist2009mod2.pdf |publisher=[[Washington State Transportation Commission]] |date=July 26, 2009 |accessdate=}}</ref>
<ref name="WSF-info">{{cite web |date=February 2014 |title=WSDOT Ferries Division (WSF) – Nation’s Largest Ferry System |publisher=Washington State Ferries |url=http://www.wsdot.wa.gov/NR/rdonlyres/6C78A08B-19A1-4919-B6E6-E9EF83E6376D/96747/WSFFactSheet_Feb2014_Web.pdf |format=PDF |accessdate=}}</ref>
Every year, the [[Washington State Department of Transportation]] (WSDOT) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of [[average annual daily traffic]] (AADT), which is a measure of traffic volume for any average day of the year. In 2013, WSDOT calculated that between x and x vehicles per day used the highway, mostly in the x area.<ref name="ATR">{{cite report |title=2013 Annual Traffic Report |year=2013 |url=http://www.wsdot.wa.gov/mapsdata/travel/pdf/Annual_Traffic_Report_2013.pdf |format=PDF |pages= |publisher=Washington State Department of Transportation |accessdate=}}</ref>
<ref name="minutes-1953">{{cite web |url=http://www.itd.idaho.gov/Board/minutes/51-96/1953.pdf |title=Minutes of the Idaho Board of Highway Directors and the Idaho Transportation Board |publisher=[[Idaho Transportation Department]] |format=PDF |page=63 |date=July 25, 1953 |accessdate=}}</ref>
<ref name="itd-dataquest">{{cite web |year=2011 |title=Highway Data Quest |publisher=Idaho Transportation Department |url=http://hdq.itd.idaho.gov/webster.html |accessdate=}}</ref>
<ref name="nrhp-">{{cite web |date=March 1, 1983 |title=National Register of Historic Places; Annual Listing of Historic Properties |publisher=United States Department of the Interior, National Park Service |url= |page= |format=PDF |accessdate=}}</ref>
<ref name="gr-1915">{{cite book |title=Good Roads: Devoted to the Construction and Maintenance of Roads and Streets, Volume 47 |chapter=The Survey of the Idaho State Highway System |page=219 |url=http://books.google.com/books?id=VI8lAAAAMAAJ |publisher=[[Burton Publishing Company]] |publication-place=[[Kansas City, Kansas]] |date=June 5, 1915 |accessdate=}}</ref>
<ref name="usroute-map">{{cite map |publisher=[[American Association of State Highway and Transportation Officials]] |title=United States System of Highways |date=November 11, 1926 |url=http://www.okladot.state.ok.us/hqdiv/p-r-div/maps/misc-maps/1926us.pdf |format=PDF |accessdate=}}</ref>
<ref name="rand1947-map">{{cite map |publisher=[[Rand McNally]] |title=Rand McNally Road Map of the United States |year=1947 |url=http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~23824~920008?id=1-1-23824-920008&name=Road+map+United+States |forma=[[MrSID]] |scale=1:7,500,000 |accessdate=}}</ref>
Every year, the [[Idaho Transportation Department]] (ITD) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of [[average annual daily traffic]] (AADT), which is a measure of traffic volume for any average day of the year. In 2011, ITD calculated that between x and x vehicles per day used the highway, mostly in the x area.<ref name="itd-dataquest">{{cite web |year=2011 |title=Highway Data Quest |publisher=Idaho Transportation Department |url=http://hdq.itd.idaho.gov/webster.html |accessdate=}}</ref>