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Trucks continue to move the lion's share of freight in the United States. Last year, the trucking industry hauled more than 9 billion tons or 68.9 percent of all U.S. freight compared with 12.9 percent moved by railroads, according to data recently released by the American Trucking Associations (ATA).

Pipeline carriers moved 9.4 percent, water transport firms, 7.7 percent, intermodal carriers, 0.9 percent, and air transporters, 0.1 percent of all U.S. freight.

Truckers earned $610 billion in revenue last year and likely will surpass the $1 trillion revenue mark by 2015, when they'll transport more than 87 percent of all U.S. freight, ATA said.