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KEY: N = data do not exist.
a Includes the 50 states and the District of Columbia. When states did not submit reports, data was estimated by the U.S. Department of Transportation, Federal Highway Administration.
KEY: U = data are not available.
a Includes civil and joint-use civil-military airports, heliports, STOL (short takeoff and landing) ports, and seaplane bases in the United States and its territories. Sole-use military airports are included beginning in 2007.
bTotal airports in 2006 does not sum from Public and Private based on the source data.
c Total Landing Areas includes airports, heliports, seaplane bases, gliderports, balloonports, and ultralights.
dMilitary includes...
KEY: kWh = kilowatt-hour; N = data do not exist; R = revised; U = data are not available.
a Excluding Amtrak and all non-Class I railroads, except for Section IV.
b Operating expenses include equipment, joint facility rents, leased roads and equipment, and all taxes except Federal income.
c Data for 2003 indicates operating revenues and expenses instead of total revenues and expenses, the data source has changed.
d Safety figures from U.S. Department of Transportation...
KEY: N = data do not exist; R = revised; U = data are not available.
a The Federal Highway Trust Fund was created with the enactment of the Highway Revenue Act of 1956. The total receipts shown for 1995 are overstated by approximately $1.59 billion due to a fiscal year (FY) 1994 error by the Treasury Department in reconciling estimated deposits to the actual tax revenue. The correction was made after the close of FY1994 and is shown in FY1995 receipts.
b Figures obtained by addition/subtraction and may not appear directly in data source.
...KEY: N = data does not exist.
a 1960-95 data includes the 50 states and the District of Columbia; 1996-2008 data includes the 50 states, District of Columbia, and Puerto Rico; 2011-14 data includes the 50 states and the District of Columbia
b Paved mileage includes the following categories: low type (an earth, gravel, or stone roadway that has a bituminous surface course less than 1" thick); intermediate type (a mixed bituminous or bituminous penetration roadway on a flexible base having a combined surface and base...
KEY: N = data do not exist; R = revised; U = data are not available.
a All public road and street mileage in the 50 states and the District of Columbia. For years prior to 1980, some miles of nonpublic roadways are included. No consistent data on private road mileage are available. Beginning in 1998, approximately 43,000 miles of Bureau of Land Management Roads are excluded. 2010 Missouri and Wyoming's data are 2009.
b Data represent miles of road owned (aggregate length of road, excluding yard tracks, sidings, and parallel lines...