The data describes U.S. transportation system mileage from 2004 through 2015, with a breakdown by type. In 2015, the U.S. highway system measured over 4.1 million miles. According to the source, the U.S. highway system encompasses all public road and street mileage in the 50 states and the District of Columbia.
2004 | 3981512 | 97662 | 22256 | 25000 | 166669 | 1925748 |
2005 | 3995635 | 95664 | 22007 | 25000 | 166760 | 1962351 |
2006 | 4016741 | 94801 | 21708 | 25000 | 166719 | 2022474 |
2007 | 4032126 | 94313 | 21708 | 25000 | 169846 | 2025731 |
2008 | 4042778 | 94082 | 21178 | 25000 | 173789 | 2075191 |
2009 | 4050717 | 93921 | 21178 | 25000 | 175965 | 2086689 |
2010 | 4067077 | 95573 | 21178 | 25000 | 181986 | 2102366 |
2011 | 4077756 | 95387 | 21225 | 25000 | 183580 | 2121217 |
2012 | 4092730 | 95391 | 21334 | 25000 | 186221 | 2137866 |
2013 | 4115462 | 95235 | 21356 | 25000 | 192412 | 2149697 |
2014 | 4177073 | 94372 | 21356 | 25000 | 199659 | 2169254 |
2015 | 4154727 | 93628 | 21358 | 25000 | 208616 | 2190494 |