Figure 1,,,,,,
Trends in Lane-Miles of Roadway by Functional Class: 1980–2000,,,,,,
(Index: 1980 = 100),,,,,,
Year,Interstates,Other principal arterials,Minor arterials,Collectors,Local,Total
1980,100,100,100,100,100,100
1981,98,97,97,99,100,99
1982,102,102,103,104,100,101
1983,104,104,104,104,101,102
1984,105,105,104,103,101,102
1985,105,105,104,103,100,101
1986,106,106,106,103,100,102
1987,108,108,107,104,100,102
1988,109,109,107,104,100,102
1989,110,110,106,104,100,102
1990,110,113,106,104,100,102
1991,111,116,104,104,100,102
1992,112,121,106,103,101,103
1993,112,122,108,102,101,103
1994,113,124,109,102,101,103
1995,113,125,109,102,101,103
1996,114,126,110,102,101,103
1997,114,127,111,102,102,104
1998,115,128,110,102,101,103
1999,116,128,109,102,101,103
2000,116,129,110,102,102,104
"SOURCES: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual editions), table HM-60.",,,,,,