How We Travel: A Sustainable National Program For Travel Data August 15, 2011 The U.S. transportation system serves hundreds of millions of travelers and handles millions of tons of freight each day to help ensure the efficient movement Share:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Reddit (Opens in new window)Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)