Table 1-4: Public Road and Street Mileage in the United States by Type of Surface

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  1960 1965 1970 1975 1980 1985 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
TOTAL paved and unpaved 3,546 3,690 3,730 3,838 3,860 3,864 3,867 3,884 3,901 3,905 3,907 3,912 3,934 3,958 3,949 3,930 3,950 3,962 3,981 3,988 3,995 4,010 4,031 4,047 4,058 U U 3,981
Pavedb, total 1,230 1,455 1,658 1,855 2,073 2,114 2,255 2,280 2,303 2,278 2,342 2,378 2,381 2,410 2,420 2,451 2,504 2,523 2,578 2,612 2,578 2,601 2,630 2,635 2,734 U U 2,605
Low and intermediate typec 672 758 897 967 1,041 1,015 1,025 1,030 1,026 1,010 1,043 1,062 1,066 N N N N N N N N N N N N U U N
High-typec 558 696 762 888 1,032 1,099 1,230 1,250 1,277 1,268 1,299 1,316 1,314 N N N N N N N N N N N N U U N
Unpavedd, total 2,315 2,235 2,072 1,983 1,787 1,750 1,612 1,604 1,598 1,628 1,564 1,534 1,554 1,548 1,529 1,479 1,446 1,439 1,403 1,376 1,418 1,409 1,402 1,412 1,324 U U 1,375

KEY: N = data do not exist; U = data are unavailable.

a 1960-95 data include the 50 states and the District of Columbia; 1996-2008 data include the 50 states, District of Columbia, and Puerto Rico.

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 thickness of less than 7"); high-type flexible (a mixed bituminous or bituminous penetration roadway on a flexible base having a combined surface and base thickness of 7" or more; high-type composite (a mixed bituminous or bituminous penetration roadway of more than 1" compacted material on a rigid base with a combined surface and base thickness of 7" or more; high-type rigid (Portland cement concrete roadway with or without a bituminous wearing surface of less than 1").

c Beginning in 1997,data no longer available for paved minor collectors and local public roads.

d Unpaved mileage includes the following categories: unimproved roadways using the natural surface and maintained to permit passability; graded and drained roadways of natural earth aligned and graded to permit reasonably convenient use by motor vehicles, and that have adequate drainage to prevent serious impairment of the road by normal surface water–surface may be stabilized; and soil, gravel, or stone roadways drained and graded with a surface of mixed soil, gravel, crushed stone, slag, shell, etc.–surface may be stabilized. The percentage of unpaved roads that are nonsurfaced dropped from approximately 42% in the 1960s to about 37% in the first half of the 1970s, to about 32% in 1980 and has held at about 22% since 1985.

NOTES

A public road is any road under the jurisdiction of and maintained by a public authority (federal, state, county, town or township, local government or instrumentality thereof) and open to public travel. No consistent data on private road mileage are available (although prior to 1980 some nonpublic roadway mileage are included). Most data are provided by the states to the US DOT Federal Highway Administration (FHWA). Some years contain FHWA estimates for some states.

Numbers may not add to totals due to rounding.

SOURCES

1960-95: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995 (Washington, DC), table HM-212, available at http://www.fhwa.dot.gov/policy/ohpi/hss/hsspubs.cfm as of Jan. 7, 2010.

1996-2008: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual issues), table HM-12, available at http://www.fhwa.dot.gov/policy/ohpi/hss/hsspubs.cfm as of Jan. 7, 2010.

2009-2010: Currently unavailable, U.S. Department of Transportation, Federal Highway Administration hopes to produce the data later of 2013.

2011: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual issues), table HM-12, available at http://www.fhwa.dot.gov/policy/ohpi/hss/hsspubs.cfm as of Aug. 6, 2013.