Table 1-6M: Estimated U.S. Roadway Lane-Kilometers by Functional Systema,,,,,,,,,,,,,,,,,,,,
,1980    ,1985    ,1990    ,1991    ,1992    ,1993    ,1994    ,1995    ,1996    ,1997     ,"      R,d1998 ",   R1999,2000    ,,,,,,,
TOTAL lane-kilometers,"12,749,503","12,903,711","12,956,959","13,016,041","13,074,455","13,087,501","13,104,911","13,129,436","13,162,268","R13,264,917","13,133,628","13,161,180","13,234,268",,,,,,,
Urban,,,,,,,,,,,,,,,,,,,,
Interstates,"77,986","92,207","100,124","101,109","108,254","111,341","113,993","114,870","115,535","R116,286","117,492","117,957","118,955",,,,,,,
Other arterialsb,"536,995","598,111","642,733","647,536","673,041","700,686","712,093","717,491","723,368","R730,035","730,739","724,741","733,631",,,,,,,
Collectors,"233,561","261,320","270,000","266,005","283,465","289,123","295,078","297,780","300,823","R303,925","301,805","299,898","303,471",,,,,,,
Local,"1,396,888","1,530,515","1,675,546","1,693,477","1,765,643","1,801,744","1,817,300","1,831,224","1,849,870","R1,879,627","1,894,212","1,908,606","1,926,127",,,,,,,
    Total,"2,245,429","2,482,154","2,688,403","2,708,127","2,830,403","2,902,894","2,938,464","2,961,365","2,989,596","R3,029,873","3,044,248","3,051,202","3,082,183",,,,,,,
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Rural,,,,,,,,,,,,,,,,,,,,
Interstates,"210,792","212,284","218,663","219,680","214,794","212,655","211,252","212,298","213,983","214,308","214,415","215,974","216,597",,,,,,,
Other arterialsb,"816,095","820,773","832,581","833,339","847,664","846,364","852,659","854,089","857,549","R864,200","865,816","867,977","868,914",,,,,,,
Collectorsc,"2,303,401","2,360,568","2,361,876","2,361,810","2,319,815","2,308,561","2,304,885","2,281,129","2,279,896","R2,283,075","2,278,467","2,275,643","2,276,683",,,,,,,
Local,"7,173,786","7,027,931","6,855,435","6,893,084","6,861,779","6,817,027","6,797,650","6,820,554","6,821,243","R6,873,460","6,730,682","6,750,384","6,789,892",,,,,,,
    Total,"10,504,074","10,421,557","10,268,556","10,307,914","10,244,052","10,184,606","10,166,447","10,168,070","10,172,671","R10,235,043","10,089,380","10,109,978","16,338,197",,,,,,,
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 138,400 lane-kilometers of Bureau of Land Management roads are excluded.",,,,,,,,,,,,,,,,,,,,
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"NOTES:  In estimating rural and urban lane kilometers, the U.S. Department of Transportation, Federal Highway Administration assumed that rural minor collectors and urban/rural local roads are two lanes wide.",,,,,,,,,,,,,,,,,,,,
Numbers may differ slightly from previous year's metric tables because a higher precision conversion factor was used.,,,,,,,,,,,,,,,,,,,,
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"SOURCES:  1980-95:  U.S. Department of Transportation, Federal Highway Administration, Office of Highway Information Management, table HM-260 (unpublished).",,,,,,,,,,,,,,,,,,,,
"1996-2000:  Ibid., Highway Statistics (Washington, DC: Annual issues), table HM-60.  Internet address www.fhwa.dot.gov/ohim.ohimstat.htm as of  Dec. 27, 2001.",,,,,,,,,,,,,,,,,,,,
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