How many miles of interstate highways are there in the United States?

Answer

There are 66 primary interstate highway mile markers in the US mainland. As of the year 2010, the US interstate highways had a total length of 47,182 miles or 75,932 km. This length made the US interstate highways the second longest in the world, after the total length of China's.
Q&A Related to "How many miles of interstate highways are there..."
There are 46,876 miles of interstate highway in the United States. Source: http://www.fhwa.dot.gov/i. ntersta.
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Interstate 10 in Texas. because it goes east west I think one exit number is like 800-something.
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Type your answer here. California.
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The primary purpose of mile marker signage is to enable
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Mile Markers are used to identify exits on major highways. They appear every mile between exits. Mile markers are read, for instance, number 111 at any given ...
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