Figure 1-2: Urban Road Conditions in Illinois: 2000

Figure 1-2: Urban Road Conditions in Illinois: 2000

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(Miles)

  Interstate Other Freeways & Expressways Other Principal Arterial Urban Minor Arterial Urban Collector
Total 649 85 2,581 298 154
Very good 11 0 87 223 152
Good 218 4 666 0 0
Fair 222 48 1,329 17 2
Mediocre 157 25 371 17 0
Poor 41 8 128 41 0

(Percent)

  Interstate Other freeways and expressways Other principal arterial Urban minor arterial Urban collector
Total 100 100 100 100 100
Very good 2 0 3 75 99
Good 34 5 26 0 0
Fair 34 56 51 6 1
Mediocre 24 29 14 6 0
Poor 6 9 5 14 0

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.