Lots More Information

Related HowStuffWorks Articles

• How Bridges Work
• How Iron and Steel Work
• How Skyscrapers Work
• Why are the insides of tunnels usually covered in ceramic tile?
• What would happen if I drilled a tunnel through the center of the Earth and jumped into it?
• Why do bridges ice before the rest of the highway?

More Great Links

• Building Big
• Discovery: Extreme Engineering
• Massachusetts Turnpike Authority: Big Dig
• Chesapeake Bay Bridge-Tunnel
• Port Authority of New York and New Jersey: Holland Tunnel

Sources

• Building Big
  http://www.pbs.org/wgbh/buildingbig/
• Extreme Engineering
  http://dsc.discovery.com/convergence/engineering/archives/archives.html
• Gundersen, P. Erik. "The Handy Physics Answer Book," Visible Ink Press, Michigan, 1995.
• Lundhus, Peter. "Bridging Borders in Scandinavia," Scientific American Presents: The Tall, the Deep, the Long, 1999.
• Macaulay, David. "Building Big: theCompanion to the PBS Series," Walter Lorraine Books, New York, 2000.
• Massachusetts Turnpike Authority
  http://www.masspike.com/bigdig/index.html
• Patel, Mukul and Michael Wright, Ed. "How Things Work Today." Crown Publishers, New York, 2000.
• Sillery, Bob. "Subterranean Giant," Popular Science, June 2002.
  http://www.popsci.com/popsci/automotivetech/a0703bcc2eb84010vgnvcm1000004eecbccdrcrd.html
• "Tunnel Monsters at Work," Popular Science.
  http://www.popsci.com/popsci/technology/generaltechnology/0e1877530caf9010vgnvcm1000004eecbccdrcrd.html
• Vizard, Frank. "The Big Dig," Popular Science, June 2001, pp. 53-57.