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

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

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(Miles)

  Interstate Other Freeways & Expressways Other Principal Arterial Urban Minor Arterial Urban Collector
Total 499 225 1,973 517 39
Very good 20 8 12 22 0
Good 180 35 106 70 0
Fair 107 141 742 254 7
Mediocre 143 33 540 125 3
Poor 49 8 573 46 29

(Percent)

  Interstate Other Freeways & Expressways Other Principal Arterial Urban Minor Arterial Urban Collector
Total 100 100 100 100 100
Very good 4 4 1 4 0
Good 36 16 5 14 0
Fair 21 63 38 49 18
Mediocre 29 15 27 24 8
Poor 10 4 29 9 74

NOTE: Numbers may not add to 100 due to rounding.

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.