In 2010 it covered 47,182 miles.
In 2010 it covered 47,182 miles.
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As of 2012, the US interstate highway system includes almost 50,000 miles.
The National Defense Highway System is usually called the Interstate Highway System or the Eisenhower Highway System.
The Highway Transportation System
a national highway system
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As of 2006, there were 46,876 miles of roadway in the Dwight D. Eisenhower National System of Interstate and Defense Highways.