Table 1-6: Illinois Road Condition by Functional System -- Urban

Table 1-6: Illinois Road Condition by Functional System -- Urban

(Miles)

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  1995 1996 1997 1998 1999 2000
Interstate (total reported) 635 642 646 N 649 649
Very good 38 30 33 N 40 11
Good 87 124 124 N 190 218
Fair 187 188 201 N 200 222
Mediocre 209 224 219 N 176 157
Poor 114 76 69 N 43 41
Not reported 0 0 0 647 1 1
Other freeways and expressways (total reported) 82 75 75 N 84 85
Very good 2 2 0 N 0 0
Good 13 13 12 N 10 4
Fair 30 15 19 N 39 48
Mediocre 20 29 33 N 28 25
Poor 17 16 11 N 7 8
Not reported 0 0 0 82 0 0
Other principal arterial (total reported) 2,593 2,602 2,606 N 2,559 2,581
Very good 30 24 41 N 85 87
Good 188 173 176 N 652 666
Fair 1,259 1,204 1,201 N 1,266 1,329
Mediocre 620 584 576 N 397 371
Poor 496 617 612 N 159 128
Not reported 0 0 0 2,603 50 44
Urban minor arterial (total reported) N N N N N 298
Very good N N N N N 223
Good N N N N N 0
Fair N N N N N 17
Mediocre N N N N N 17
Poor N N N N N 41
Not reported N N N N N N
Urban collector (total reported) N N N N N 154
Very good N N N N N 152
Good N N N N N 0
Fair N N N N N 2
Mediocre N N N N N 0
Poor N N N N N 0
Not reported N N N N N N

KEY: N = data do not exist.

NOTE: In 2000, the Federal Highway Administration began reporting road condition for urban minor arterials and urban 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.