Overall, there were 2.95 million miles drive on U.S. highways in 2011, according to the survey.
The DOT said the total was the eight-highest traffic volume that has ever been recorded by its surveys. The agency added that the number was double the number of miles that were driven by American since 1980.
Transportation Secretary Anthony FoxxAnthony FoxxToll roads poised to boom under Trump plan Transportation chief urges Trump to press forward on self-driving cars Five transportation issues to watch under Trump MORE said it was helpful to transportation officials to know which roads were being used most often.
“Better information means cities and states can more efficiently target congestion and help people get home from work faster,” Foxx said in a statement. “Over the past four years, DOT has improved more than 331,000 miles of roads with federal funds, but we know there’s a lot of work that still needs to be done. Information like this, along with new construction and design technologies, help us stretch our dollars further, making a bigger difference for even more people.”
The single busiest highway in the U.S. was California's Interstate 5, according to the survey. There were 21.4 billion miles traveled on that highway alone in 2011.
California is also home to the second and third busiest individual highways in the U.S. with it's portion of Interstate 10 and Interstate 110.
The full DOT report on highway traffic volume can be read here.
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