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^ a b c d Droz, Robert V. ⇒U.S. Highways : From US 1 to (US 830). URL accessed 02:55, 4 July 2006 (UTC).
^ “ ⇒Arizona DOT Right-of-Way Resolutions”. Arizona Department of Transportation. 2008年3月30日閲覧。
^ ⇒Establishment of a Marking System of the Routes Comprising the National System of Interstate and Defense Highways (PDF, 7.88 KB) (Retained from August 10, 1973)
^ Jones, Ben (2006年12月18日). “'Interstate 41' on near horizon”. The Post Crescent
^ “ ⇒Ross (AR04) Newsletter ? Interstate 49”. Congressman Mike Ross (2001年6月8日). 2009年6月7日閲覧。
^ Texas Department of Transportation, ⇒I-69/TTC (Northeast Texas to Mexico). Retrieved August 2007.
^ Woodard, Johnny (2008年10月8日). “ ⇒I-74 four-lane to Lumberton opened” (PDF). The Laurinburg Exchange. 2009年6月7日閲覧。
^ Richard F. Weingroff, ⇒U.S. 11 Rouses Point, New York, to New Orleans, Louisiana
^ AASHTO (2000年1月). “ ⇒Establishment and Development of United States Numbered Highways” (PDF). 2008年1月23日閲覧。
^ “ ⇒Bannered U.S. Highways”. Us-highways.com. 2010年4月11日閲覧。
^ Google searches on thomas.loc.gov for "United States Route", "U.S. Route", "United States Highway" and "U.S. Highway"
^ ⇒http://www.deldot.gov/information/pubs_forms/manuals/traffic_counts/2006/pdf/rpt_pgs1_38_rev.pdf DelDOT 2006 Traffic Count and Mileage Report
^ ⇒Segment Descriptions for Highway 006 Colorado Department of Transportation
^ a b c d e f g h i j k l m n Richard F. Weingroff, ⇒From Names to Numbers: The Origins of the U.S. Numbered Highway System
^ Motor Sign Uniformity, New York Times, April 16, 1922
^ United States System of Highways (Map). Bureau of Public Roads. 1926. {{cite map}}: |access-date=を指定する場合、|url=も指定してください。 (説明) File:United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials.jpg
^ United States System of Highways, November 11, 1926
^ “ ⇒U.S. 22: The William Penn Highway”. Fhwa.dot.gov. 2010年4月11日閲覧。
^ United States Numbered Highways, American Highways (AASHO), April 1927
^ a b “ ⇒U.S. 11 - Rouses Point, New York, to New Orleans, Louisiana”. Fhwa.dot.gov. 2010年4月11日閲覧。
^ “ ⇒Divided (Split) Routes”. U.S. Highways. 2010年4月11日閲覧。
^ Robert V. Droz. “ ⇒Alaska's U.S. Highway(s)”. Us-highways.com. 2010年4月11日閲覧。
^ Feldstein, Dan (1999年6月27日). “ ⇒A rare quiet interlude for area's first freeway Next major upgrade: Causeway in 2002”. Houston Chronicle. 2009年6月9日閲覧。
^ Correspondence between the Division of Highways and American Association of State Highway Officials, transcribed at ⇒California Highways: State Route 66
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