อ้างอิง ของ ทางหลวงสหรัฐหมายเลข_1

  1. ↑ American Association of State Highway and Transportation Officials, United States Numbered Highways, 1989 Edition
  2. ↑ "America's longest north-south highways". http://magicvalley.com/. Times-News. สืบค้นเมื่อ 13 October 2014. External link in |website= (help)
  3. ↑ "E. W. James on designating the Federal-aid system and developing the U.S. numbered highway plan". Fhwa.dot.gov. สืบค้นเมื่อ 2012-08-09.
  4. ↑ Rand McNally Auto Road Atlas, 1926, accessed via the Broer Map Library
  5. ↑ 490 Whitehead St (1970-01-01). "490 Whitehead St, Key West, FL 33040 – Google Maps". Maps.google.com. สืบค้นเมื่อ 2012-08-09.
  6. ↑ Google Maps street maps and USGS topographic maps, accessed via ACME Mapper
  7. ↑ John Gordon, The Virginian-Pilot, US Highway 17 to Florida: Scenic, Historic and Very Slow, December 29, 1993: "Drivers know they're in Florida when they notice the U.S. Highway signs are color-coded for easy recognition. The US 17 signs, for example, are yellow, while those of US 1 are red, US 90 blue. and US 27 green."

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