Lots More Information

Related HowStuffWorks Articles

• How Intelligent Highways Will Work
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• How Tunnels Work
• Why are the insides of tunnels usually covered in ceramic tiles?

More Great Links

• The Federal Highway Administration
• The Turner-Fairbank Highway Research Center
• The U.S. Department of Transportation

Sources

• Bishop, Richard. "What Happened to Automated Highway Systems (AHS)?" Traffic Technology International. August 2001.
  http://faculty.washington.edu/jbs/itrans/bishopahs.htm
• "Channel Tunnel." 2008. Encyclopaedia Britannica. (June 21, 2008)
  http://www.britannica.com/eb/article-9033276/Channel-Tunnel#240863.hook
• Federal Highway Administration. "Demo '97: Proving AHS Works." U.S. Department of Transportation. July 1997.
  http://www.tfhrc.gov/pubrds/july97/demo97.htm
• Federal Highway Administration. "The National Highway System." U.S. Department of Transportation. May 29, 2008. (June 21, 2008)
  http://www.fhwa.dot.gov/planning/nhs/
• Ferlis, Robert A. "The Dream of an Automated Highway." Public Roads. July 2007.
  http://www.tfhrc.gov/pubrds/07july/07.htm
• Smart, John. "Underground Automated Highways (UAH) for High-Density Cities." Acceleration Studies Foundation. 2005.
  http://www.accelerating.org/articles/uahsframework.pdf
• "Underground Automated Highways (UAH) for High-Density Cities: A 2030-2060 Forecast." Acceleration Watch. (June 21, 2008)
  http://www.accelerationwatch.com/articles/undergroundhighwaysystems.html
• Wells, H.G. "The Time Machine." William Heinemann. 1895.