Figure 1-1: Rural Road Conditions in Illinois: 2000

Figure 1-1: Rural Road Conditions in Illinois: 2000

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(Miles)

  Interstate Other Principal Arterial Minor Arterial Major Collector
Total 1,515 2,613 4,822 N
Very good 99 94 403 N
Good 798 911 1,167 N
Fair 330 1,389 2,825 N
Mediocre 280 187 217 N
Poor 8 32 210 N

(Percent)

  Interstate Other principal arterial Minor arterial Major collector
Total 100 100 100 N
Very good 7 4 8 N
Good 53 35 24 N
Fair 22 53 59 N
Mediocre 18 7 5 N
Poor 1 1 4 N

KEY: N = Data do not exist

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.