Table 1-6: Estimated U.S. Roadway Lane-Miles by Functional Systema,,,,,,,,,,,,,,,,,,,,
,1980   ,1985   ,1990   ,1991   ,1992   ,1993   ,1994   ,1995   ,1996   ,1997     ,"         R,d1998 ",      R1999,2000   ,,,,,,,
TOTAL lane-miles,"7,922,174","8,017,994","8,051,081","8,087,793","8,124,090","8,132,196","8,143,014","8,158,253","8,178,654","R8,242,437","8,160,858","8,177,983","8,223,393",,,,,,,
Urban,,,,,,,,,,,,,,,,,,,,
Interstates,"48,458","57,295","62,214","62,826","67,266","69,184","70,832","71,377","71,790","R72,257","73,006","73,293","73,915",,,,,,,
Other arterialsb,"333,673","371,649","399,376","402,360","418,208","435,386","442,474","445,828","449,480","R453,623","454,060","450,411","455,857",,,,,,,
Collectors,"145,128","162,377","167,770","165,288","176,137","179,653","183,353","185,032","186,923","R188,850","187,533","186,334","188,568",,,,,,,
Local,"867,986","951,018","1,041,136","1,052,278","1,097,120","1,119,552","1,129,218","1,137,870","1,149,456","R1,167,946","1,177,009","1,185,948","1,196,840",,,,,,,
    Total,"1,395,245","1,542,339","1,670,496","1,682,752","1,758,731","1,803,775","1,825,877","1,840,107","1,857,649","R1,882,676","1,891,608","1,895,986","1,915,180",,,,,,,
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Rural,,,,,,,,,,,,,,,,,,,,
Interstates,"130,980","131,907","135,871","136,503","133,467","132,138","131,266","131,916","132,963","133,165","133,231","134,198","134,587",,,,,,,
Other arterialsb,"507,098","510,005","517,342","517,813","526,714","525,906","529,818","530,706","532,856","R536,989","537,993","539,293","539,918",,,,,,,
Collectorsc,"1,431,267","1,466,789","1,467,602","1,467,561","1,441,466","1,434,473","1,432,189","1,417,428","1,416,662","R1,418,637","1,415,774","1,413,953","1,414,665",,,,,,,
Local,"4,457,584","4,366,954","4,259,770","4,283,164","4,263,712","4,235,904","4,223,864","4,238,096","4,238,524","R4,270,970","4,182,252","4,194,553","4,219,043",,,,,,,
    Total,"6,526,929","6,475,655","6,380,585","6,405,041","6,365,359","6,328,421","6,317,137","6,318,146","6,321,005","R6,359,761","6,269,250","6,281,997","6,308,213",,,,,,,
KEY: R = revised.,,,,,,,,,,,,,,,,,,,,
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a  Includes the 50 States and the District of Columbia.,,,,,,,,,,,,,,,,,,,,
"b  For urban: the sum of other freeways and expressways, other principal arterials, and minor arterials.  For rural: the sum of other principal arterials and minor arterials.",,,,,,,,,,,,,,,,,,,,
c  Includes minor and major collectors. ,,,,,,,,,,,,,,,,,,,,
"d  Beginning in 1998, approximately 86,000 lane-miles of Bureau of Land Management roads are excluded.",,,,,,,,,,,,,,,,,,,,
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"NOTE:  In estimating rural and urban lane mileage, the U.S. Department of Transportation, Federal Highway Administration assumed that rural minor collectors and urban/rural local roads are two lanes wide.",,,,,,,,,,,,,,,,,,,,
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"SOURCES:  1980-95:  U.S. Department of Transportation, Federal Highway Administration, Office of Highway Information Management, table HM-260 (unpublished).",,,,,,,,,,,,,,,,,,,,
"1996-1998, 2000:  Ibid., Highway Statistics (Washington, DC: Annual issues), table HM-60.  Internet address www.fhwa.dot.gov/ohim.ohimstat.htm as of  Dec. 27, 2001.",,,,,,,,,,,,,,,,,,,,
"1999: Ibid., personal communication, June 5, 2002.",,,,,,,,,,,,,,,,,,,,
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