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Table
1-4: Public Road and Street Mileage in
the United States by Type of Surfacea
(Thousands of miles)
Excel | CSV
| 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 |
| 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 |
| Low
and intermediate type |
672 |
758 |
897 |
967 |
1,041 |
1,015 |
1,025 |
1,030 |
1,026 |
1,010 |
1,043 |
1,062 |
1,066 |
dN |
dN |
dN |
dN |
dN |
dN |
dN |
dN |
dN |
dN |
dN |
| High-type |
558 |
696 |
762 |
888 |
1,032 |
1,099 |
1,230 |
1,250 |
1,277 |
1,268 |
1,299 |
1,316 |
1,314 |
dN |
dN |
dN |
dN |
dN |
dN |
dN |
dN |
dN |
dN |
dN |
| Unpavedc,
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 |
KEY: N = data do not
exist.
a 1960-95 data include the 50
states and the District of Columbia; 1996-2007 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 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.
d Data no longer available for paved minor collectors and
local public roads.
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.
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 March 2009.
1996-2007: 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 March 2009.
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