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.

Bureau of Transportation Statistics