Table 1-27 Condition of U.S. Roadways by Functional System

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  1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
RURAL International Roughness Index                                          
Interstates miles reported 31,737 29,089 31,502 31,254 31,312 31,431 30,498 32,820 32,888 32,951 32,907 31,956 31,341 30,802 30,512 30,040 30,076 29,910 U 29,349 30,246
>220, percent 0.8 1.0 1.1 1.8 0.6 0.7 0.7 0.5 0.4 0.3 0.4 0.3 0.4 0.5 0.5 0.3 0.3 0.3 U 0.5 0.5
171-220, percent 4.4 6.0 5.4 4.5 3.3 3.0 3.4 1.8 1.8 1.6 1.7 1.3 1.6 1.3 1.5 1.6 1.6 1.4 U 1.3 1.3
95-170, percent 48.2 48.6 50.4 43.0 40.8 39.8 34.3 32.1 29.2 27.1 25.7 25.2 24.9 23.1 20.8 20.4 19.8 18.9 U 18.6 17.1
60-94, percent 27.1 36.1 33.2 36.9 38.8 41.0 42.6 44.0 44.8 43.3 44.0 43.9 46.9 47.0 46.5 46.8 46.9 45.4 U 42.6 41.7
<60, percent 19.5 8.3 9.9 13.9 16.6 15.7 19.0 21.5 23.9 27.7 28.2 29.3 26.2 28.1 30.7 30.9 31.4 34.0 U 37.0 39.4
Miles not reported 1,280 3,563 955 1,326 1,508 1,382 2,313 153 162 109 84 87 103 92 71 311 117 252 U 907 318
Other principal arterials miles reported 90,522 78,296 89,506 89,265 92,103 92,170 93,333 97,247 97,297 97,946 97,854 96,656 95,390 94,216 94,500 94,396 94,367 92,867 U 87,830 89,742
>220, percent 2.2 2.9 2.4 4.4 1.4 1.6 1.4 0.9 0.8 0.7 0.7 0.7 0.9 0.8 0.8 0.6 0.5 0.6 U 0.8 0.9
171-220, percent 7.0 9.2 8.2 7.6 5.8 4.9 4.6 3.7 3.2 3.0 2.7 2.8 3.3 2.8 2.5 2.5 2.4 2.4 U 2.5 2.6
95-170, percent 53.5 54.8 57.4 51.1 49.1 47.7 43.3 41.5 38.7 37.3 35.6 35.5 35.9 33.5 31.3 30.9 30.5 29.2 U 28.5 28.3
60-94, percent 22.4 26.7 26.6 27.9 34.4 37.2 38.3 40.5 42.9 42.5 44.2 44.6 44.9 45.8 46.5 46.5 47.5 46.1 U 45.8 45.1
<60, percent 14.8 6.4 5.4 9.0 9.3 8.6 12.3 13.5 14.4 16.5 16.7 16.4 14.9 17.1 18.9 19.5 19.1 21.7 U 22.5 23.1
Miles not reported 4,276 17,905 7,489 8,683 6,028 6,083 5,524 1,587 1,619 1,247 1,009 386 552 946 430 377 579 1,273 U 3,450 1,721
Minor arterials miles reported 127,818 127,197 124,877 121,443 126,381 126,525 130,591 135,192 136,096 134,706 136,955 134,984 134,884 134,358 134,914 134,798 134,386 134,551 U 122,863 129,277
>220, percent 2.7 4.1 3.5 3.7 2.3 2.3 1.9 1.7 1.7 1.7 1.3 1.3 1.4 1.4 1.7 1.2 1.3 1.7 U 2.0 2.0
171-220, percent 10.9 10.5 10.5 9.0 8.2 6.7 6.0 5.2 5.3 5.2 4.5 4.8 5.1 4.0 4.2 4.5 4.5 4.5 U 4.6 4.3
95-170, percent 52.3 55.0 57.9 54.7 50.7 50.4 47.2 47.3 46.2 44.9 43.6 43.0 44.3 42.0 40.7 40.9 40.8 41.6 U 41.0 38.2
60-94, percent 21.4 24.9 23.6 23.9 31.0 33.6 34.3 34.4 35.6 36.9 39.1 41.2 39.5 41.6 41.5 40.3 40.4 39.4 U 39.3 41.1
<60, percent 12.7 5.5 4.5 8.7 7.7 7.0 10.6 11.4 11.2 11.3 11.6 9.7 9.6 11.0 11.8 13.0 13.1 12.8 U 13.1 14.3
Miles not reported 10,819 10,731 13,294 15,708 10,978 10,978 6,664 1,968 1,436 2,874 606 607 573 1,049 455 497 616 883 U 12,422 5,831
Major collectors miles reported N N N N N N N 225,590 229,294 235,173 242,753 249,375 261,683 269,022 267,431 273,665 277,721 278,294 U 274,449 283,247
>220, percent N N N N N N N 8.8 9.0 7.7 7.4 7.2 6.2 5.6 5.4 5.4 4.8 5.0 U 6.7 6.8
171-220, percent N N N N N N N 12.2 13.1 13.2 11.2 11.1 10.8 10.5 11.0 10.8 11.2 11.1 U 11.9 12.4
95-170, percent N N N N N N N 53.2 51.9 49.4 49.0 50.4 52.8 52.7 54.4 55.3 54.6 55.2 U 48.6 48.3
60-94, percent N N N N N N N 21.0 21.9 25.4 27.2 26.4 25.4 26.1 24.1 23.3 23.4 22.5 U 25.1 26.1
<60, percent N N N N N N N 4.9 4.1 4.3 5.1 4.9 4.8 5.0 5.2 5.2 6.0 6.1 U 7.7 6.5
Miles not reported N N N N N N N N N N N N N N N N N N U N N
URBAN International Roughness Index                                          
Interstates miles reported 11,783 10,738 12,338 12,307 12,430 12,477 12,231 13,109 13,139 13,256 13,367 14,331 14,984 15,544 15,899 16,035 16,348 16,278 U 15,994 16,619
>220, percent 2.8 2.5 2.8 1.8 1.4 2.0 2.3 1.5 1.4 1.6 1.7 1.7 1.8 1.5 1.1 1.6 1.4 1.1 U 1.5 1.5
171-220, percent 8.5 8.2 10.2 8.6 7.3 7.1 7.0 5.8 5.1 5.8 6.0 5.9 5.3 4.5 4.0 4.3 4.0 4.0 U 3.7 3.7
95-170, percent 54.5 54.5 54.1 50.7 53.0 51.4 47.3 45.7 43.1 41.8 40.9 37.9 37.2 35.4 34.7 34.0 32.5 32.1 U 29.4 27.9
60-94, percent 20.1 28.3 26.7 27.5 30.7 32.9 32.0 34.9 37.1 35.9 36.0 36.6 38.2 42.0 41.4 41.3 42.9 42.0 U 40.7 39.4
<60, percent 14.0 6.5 6.2 11.4 7.6 6.7 11.4 12.0 13.3 14.9 15.4 17.9 17.4 16.6 18.7 18.8 19.2 20.9 U 24.7 27.6
Miles not reported 683 2,140 788 857 787 771 1,040 230 226 156 123 131 140 157 139 271 193 317 U 711 528
Other freeways and expressway miles reported 8,146 7,011 7,618 7,804 8,410 8,480 8,772 8,860 8,796 8,959 9,242 9,786 10,143 10,443 10,659 10,832 11,175 10,942 U 10,730 10,946
>220, percent 3.7 3.8 5.3 4.8 3.4 3.3 3.2 2.6 2.8 3.1 2.7 2.4 2.1 1.9 1.5 1.6 1.4 1.4 U 2.2 2.2
171-220, percent 9.5 9.4 12.7 9.8 8.7 8.7 8.7 8.1 8.1 7.1 7.6 8.3 7.6 6.0 5.0 5.5 5.1 5.1 U 5.6 5.4
95-170, percent 59.5 60.6 58.1 54.7 54.7 58.5 54.3 53.6 50.7 50.5 48.6 45.7 45.5 44.7 43.0 42.3 42.5 41.6 U 39.0 36.1
60-94, percent 18.1 22.7 20.9 20.4 26.3 25.2 27.1 29.0 31.6 31.5 33.3 35.0 37.4 39.6 40.1 40.5 40.6 40.4 U 39.1 39.3
<60, percent 9.3 3.5 2.9 10.3 6.8 4.2 6.6 6.8 6.8 7.7 7.9 8.6 7.4 7.9 10.3 10.0 10.3 11.6 U 14.1 17.0
Miles not reported 319 1,846 1,377 1,166 617 579 397 281 353 167 82 81 98 108 84 78 152 467 U 765 575
Other principal arterials miles reported N 30,337 38,598 41,444 44,498 45,009 44,886 48,045 47,890 48,931 50,016 53,431 56,831 59,743 61,064 61,259 62,584 58,901 U 58,419 60,623
>220, percent N 9.2 12.5 12.4 11.8 12.1 12.9 12.5 13.2 12.9 13.3 12.7 12.2 11.8 11.1 11.4 11.6 11.4 U 13.0 12.8
171-220, percent N 13.3 16.3 14.7 14.1 14.6 18.5 18.1 16.8 16.4 16.4 16.4 15.5 15.7 14.5 15.4 15.2 15.0 U 15.1 14.1
95-170, percent N 55.0 50.8 47.2 48.9 49.5 45.3 45.2 45.1 45.7 46.1 46.7 46.8 47.2 44.9 45.8 45.8 45.1 U 42.7 42.1
60-94, percent N 19.3 16.6 15.9 17.5 17.8 17.6 18.8 19.4 19.5 19.4 19.5 20.0 20.1 21.4 21.7 21.8 22.3 U 22.3 23.2
<60, percent N 3.3 3.8 9.7 7.7 6.0 5.8 5.4 5.4 5.5 4.9 4.7 5.5 5.3 8.2 5.6 5.5 6.3 U 6.9 7.8
Miles not reported N 22,498 14,492 11,352 8,485 8,209 8,246 5,154 5,426 4,126 3,422 3,440 2,863 2,064 1,765 2,030 1,975 5,654 U 6,563 4,970
Minor arterials miles reported N N N N N N N 45,182 43,830 47,657 49,021 54,129 58,473 58,699 63,020 64,287 66,134 66,068 U 66,929 65,543
>220, percent N N N N N N N 12.3 14.3 14.0 14.8 15.3 17.8 15.6 14.7 14.9 14.0 14.1 U 18.3 19.0
171-220, percent N N N N N N N 14.6 19.3 19.1 18.6 19.1 18.4 18.0 17.3 17.0 16.7 16.1 U 19.0 19.2
95-170, percent N N N N N N N 45.9 45.9 45.5 45.4 45.5 43.8 45.0 43.9 44.1 44.9 45.9 U 45.7 45.6
60-94, percent N N N N N N N 16.6 12.6 14.1 14.4 14.1 13.1 14.5 13.9 14.4 14.9 14.5 U 14.4 13.5
<60, percent N N N N N N N 10.7 7.8 7.2 6.8 6.0 7.0 6.9 10.1 9.6 9.5 9.3 U 2.6 2.7
Miles not reported N N N N N N N N N N N N N N N N N N U N N
Collectors miles reported N N N N N N N 34,819 29,726 30,468 32,491 38,349 43,619 45,210 53,236 54,673 57,194 57,177 U 65,043 62,166
>220, percent N N N N N N N 20.1 28.8 28.1 29.3 28.9 31.9 28.4 26.7 26.9 24.8 23.9 U 31.3 31.1
171-220, percent N N N N N N N 17.8 23.5 21.9 22.2 22.7 21.5 21.3 20.5 20.0 20.3 20.9 U 22.4 21.3
95-170, percent N N N N N N N 38.2 34.1 36.8 36.0 36.0 34.0 37.0 37.7 38.2 39.7 40.0 U 37.3 38.4
60-94, percent N N N N N N N 12.6 5.7 5.7 5.3 5.6 6.1 7.9 6.4 6.3 7.2 7.2 U 7.9 8.0
<60, percent N N N N N N N 11.4 7.9 7.5 7.1 6.8 6.6 5.3 8.6 8.5 8.1 8.0 U 1.1 1.2
Miles not reported N N N N N N N N N N N N N N N N N N U N N

KEY: N = data do not exist; U = data are unavailable.

NOTES

Numbers may not add to totals due to rounding.

The data of this table are not comparable to previous editions due to a change in the categories of road conditions.

Data are reported as the International Roughness Index (IRI) in inches per mile. Lower IRI represents smoother riding roadways. For more information on the rating system, refer to National Cooperative Highway Research Program (NCHRP) report 20-24(37)G, Technical Guidance for Deploying National Level Performance Measurements, available at http://onlinepubs.trb.org/onlinepubs/nchrp/docs/NCHRP20-24(37)G_FR.pdf as of November 2011.

SOURCES

Rural major collector, urban minor arterial, and urban collector:

U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual Issues), table HM-63, available at http://www.fhwa.dot.gov/policy/ohpi/hss/index.cfm as of Aug. 18, 2014.

All other categories except rural major collector, urban minor arterial, and urban collector:

1992-2012: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual Issues), table HM-64, available at http://www.fhwa.dot.gov/policy/ohpi/hss/index.cfm as of Aug. 18, 2014.