Table 1-5: Illinois Road Condition by Functional System -- Rural

Table 1-5: Illinois Road Condition by Functional System -- Rural

(Miles)

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  1995 1996 1997 1998 1999 2000
Interstate (total reported) 1,528 1,521 1,518 N 1,514 1,515
Very good 69 55 58 N 43 99
Good 380 554 553 N 549 798
Fair 498 414 435 N 469 330
Mediocre 530 468 448 N 441 280
Poor 51 30 24 N 12 8
Not reported 0 0 0 1,518 0 0
Other principal arterial (total reported) 2,634 2,638 2,625 N 2,624 2,613
Very good 45 57 34 N 74 94
Good 538 636 673 N 856 911
Fair 1,713 1,579 1,551 N 1,460 1,389
Mediocre 285 313 286 N 201 187
Poor 53 53 81 N 33 32
Not reported 0 0 0 2,631 0 0
Minor arterial (total reported) 4,822 4,814 4,832 N 4,828 4,822
Very good 429 408 303 N 794 403
Good 1,188 1,023 1,232 N 878 1,167
Fair 2,528 2,753 2,490 N 2,709 2,825
Mediocre 510 411 594 N 302 217
Poor 167 219 213 N 145 210
Not reported 0 0 0 4,830 0 0
Major collector (total reported) N N N N N N
Very good N N N N N N
Good N N N N N N
Fair N N N N N N
Mediocre N N N N N N
Poor N N N N N N
Not reported N N N N N 933

KEY: N = data do not exist.

NOTE: In 2000, the Federal Highway Administration began reporting road condition for rural major collectors using the International Roughness Index, if available. In prior years, data were only available using the Present Serviceability Rating.

NOTE FOR DATA ON THIS PAGE: Road condition is based on measured pavement roughness using the International Roughness Index (IRI). IRI is a measure of surface condition. A comprehensive measure of pavement condition would require data on other pavement distresses such as rutting, cracking, and faulting.

SOURCE FOR DATA ON THIS PAGE: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics, Washington, DC: annual editions, tables HM-63 and HM-64, available at http://www.fhwa.dot.gov/ as of Feb. 1, 2002.