Table 1-6M. Estimated U.S. Roadway Lane-Kilometers by Functional System

Table 1-6M. Estimated U.S. Roadway Lane-Kilometers by Functional System

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  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
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
TOTAL lane-kilometersR12,749,503 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.

KEY: R = revised.

NOTE: In estimating rural and urban lane mileage, the U.S. Department of Transportation, Federal Highway Administrationassumed that rural minor collectors and urban/rural local roads are two lanes wide.

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Department of Transportation, Federal Highway Administration, Office of Highway Information Management, table HM-260 (unpublished).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.