Photo of cars on a six-lane highway with entrance and exit ramps

The U.S. Interstate Highway System has almost 50,000 miles of controlled-access highways spanning the country.

Image credit: Matt H. Wade, http://en.wikipedia.org/wiki/User:UpstateNYer. CC BY-SA 3.0, http://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons.
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Last modified
25 June 2015 - 11:10am