Table 1-6M,,,,,,,,,,,,
Estimated U.S. Roadway Lane-Kilometers by Functional System,,,,,,,,,,,,
,1980,1985,1990,1991,1992,1993,1994,1995,1996,1997R,1998R,1999
Urban,,,,,,,,,,,,
Interstates,"77,986","R92,207","100,124","101,109","108,254","111,341","113,993","114,870","115,535","117,427","118,655","119,153"
Other arterials,"R536,995","R598,111","R642,733","647,536","673,041","700,686","712,093","R717,491","R723,368","733,655","734,397","728,433"
Collectors,"233,561","R261,320","270,000","266,005","283,465","289,123","295,078","R297,780","R300,823","302,022","303,928","301,932"
Local,"R1,396,888","R1,530,515","R1,675,546","1,693,477","1,765,643","1,801,744","1,817,300","R1,831,224","R1,849,870","1,897,301","1,911,925","1,926,427"
    Total,"R2,245,429","R2,482,154","R2,688,403","2,708,127","2,830,403","2,902,894","2,938,464","R2,961,365","R2,989,596","3,054,405","3,068,905","3,075,944"
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Rural,,,,,,,,,,,,
Interstates,"210,792","212,284","R218,663","219,680","214,794","212,655","211,252","R212,298","R213,983","214,308","215,073","216,635"
Other arterials,"R816,095","R820,775","R832,581","833,339","847,664","846,364","852,659","R854,089","R857,549","865,618","867,235","869,381"
Collectorsa,"R2,303,401","R2,360,572","R2,361,876","2,361,810","2,319,815","2,308,561","2,304,885","R2,281,129","R2,279,896","2,287,792","2,283,229","2,280,379"
Local,"R7,173,786","R7,027,944","R6,855,435","6,893,084","6,861,779","6,817,027","6,797,650","R6,820,554","R6,821,243","6,891,559","6,748,837","6,768,836"
    Total,"R10,504,074","R10,421,576","R10,268,556","10,307,914","10,244,052","10,184,606","10,166,447","10,168,070","R10,172,671","10,259,277","10,114,410","10,135,232"
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TOTAL lane-kilometers,"R12,749,503","R12,903,735","R12,956,959","13,016,041","13,074,455","13,087,501","13,104,911","R13,129,436","R13,162,268","13,313,681","13,183,315","13,211,176"
a Includes minor and major collectors in the 50 states and Puerto Rico.,,,,,,,,,,,,
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KEY: R = revised.,,,,,,,,,,,,
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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).",,,,,,,,,,,,
"1996-98: Ibid. Highway Statistics (Washington, DC: Annual issues), table HM-60.",,,,,,,,,,,,