The U.S. economy’s most important asset is its roughly 3.3 million tractor-trailers. Those trucks share over 4 million miles of highway and run nearly 200 billion miles annually according to federal estimates. The scale of U.S. trucking is almost as staggering as its importance. Trucks are, by far, the most common mode of transport for goods. They move about $14.1 trillion in goods annual and generate about 1% of the nation’s gross domestic product.
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