U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
1/ Sources: Country data sources is from the "World Road Statistics-2009," International Road Federation, except the United States which is from the "Highway Statistics 2008", and Canada data from Transport Canada.
2/ Data includes mainland China and China Taipai.
3/ Data is from the U.S. Department of Transportation, Federal Highway Administration, Highway Statistics 2008, Table HM-20M. Major roads include: Interstate, Other Principal Arterials, nad Other Freeways and Expressways. Secondary roads include Minor Arterials, Minor Collectors, and Local roads .