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Table 1-27: Condition of U.S. Roadways by Functional System

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 19921993199419951996199719981999200020012002200320042005200620072008200920102011201220132014
RURAL                       
Interstates miles reported31,73729,08931,50231,25431,31231,43130,49832,82032,88832,95132,90731,95631,34130,80230,51230,04030,07629,910U29,34930,20418,95028,783
>220, percent0.81.01.11.80.60.70.70.50.40.30.40.30.40.50.50.30.30.3U0.50.50.70.6
171-220, percent4.46.05.44.53.33.03.41.81.81.61.71.31.61.31.51.61.61.4U1.31.31.71.5
95-170, percent48.248.650.443.040.839.834.332.129.227.125.725.224.923.120.820.419.818.9U18.617.117.315.4
60-94, percent27.136.133.236.938.841.042.644.044.843.344.043.946.947.046.546.846.945.4U42.641.738.037.7
<60, percent19.58.39.913.916.615.719.021.523.927.728.229.326.228.130.730.931.434.0U37.039.442.344.8
Miles not reported1,2803,5639551,3261,5081,3822,31315316210984871039271311117252U90731867312
Other principal arterials miles reported90,52278,29689,50689,26592,10392,17093,33397,24797,29797,94697,85496,65695,39094,21694,50094,39694,36792,867U87,83089,70045,19787,270
>220, percent2.22.92.44.41.41.61.40.90.80.70.70.70.90.80.80.60.50.6U0.80.91.11.2
171-220, percent7.09.28.27.65.84.94.63.73.23.02.72.83.32.82.52.52.42.4U2.52.62.72.6
95-170, percent53.554.857.451.149.147.743.341.538.737.335.635.535.933.531.330.930.529.2U28.528.327.727.6
60-94, percent22.426.726.627.934.437.238.340.542.942.544.244.644.945.846.546.547.546.1U45.845.142.642.3
<60, percent14.86.45.49.09.38.612.313.514.416.516.716.414.917.118.919.519.121.7U22.523.125.826.3
Miles not reported4,27617,9057,4898,6836,0286,0835,5241,5871,6191,2471,0093865529464303775791,273U3,4501,7202723,003
Minor arterials miles reported127,818127,197124,877121,443126,381126,525130,591135,192136,096134,706136,955134,984134,884134,358134,914134,798134,386134,551U122,863129,059117,712123,840
>220, percent2.74.13.53.72.32.31.91.71.71.71.31.31.41.41.71.21.31.7U2.01.92.22.1
171-220, percent10.910.510.59.08.26.76.05.25.35.24.54.85.14.04.24.54.54.5U4.64.35.14.9
95-170, percent52.355.057.954.750.750.447.247.346.244.943.643.044.342.040.740.940.841.6U41.038.238.638.8
60-94, percent21.424.923.623.931.033.634.334.435.636.939.141.239.541.641.540.340.439.4U39.341.238.438.0
<60, percent12.75.54.58.77.77.010.611.411.211.311.69.79.611.011.813.013.112.8U13.114.315.816.2
Miles not reported10,81910,73113,29415,70810,97810,9786,6641,9681,4362,8746066075731,049455497616883U12,4225,8183,8457,481
Major collectors miles reportedNNNNNNN225,590229,294235,173242,753249,375261,683269,022267,431273,665277,721278,294U274,449283,044244,708264,387
>220, percentNNNNNNN8.89.07.77.47.26.25.65.45.44.85.0U6.76.87.97.7
171-220, percentNNNNNNN12.213.113.211.211.110.810.511.010.811.211.1U11.912.311.712.5
95-170, percentNNNNNNN53.251.949.449.050.452.852.754.455.354.655.2U48.648.346.245.9
60-94, percentNNNNNNN21.021.925.427.226.425.426.124.123.323.422.5U25.126.127.126.5
<60, percentNNNNNNN4.94.14.35.14.94.85.05.25.26.06.1U7.76.57.07.3
Miles not reportedNNNNNNNNNNNNNNNNNNUNNNN
URBAN                       
Interstates miles reported11,78310,73812,33812,30712,43012,47712,23113,10913,13913,25613,36714,33114,98415,54415,89916,03516,34816,278U15,99416,38310,95417,699
>220, percent2.82.52.81.81.42.02.31.51.41.61.71.71.81.51.11.61.41.1U1.51.41.51.6
171-220, percent8.58.210.28.67.37.17.05.85.15.86.05.95.34.54.04.34.04.0U3.73.63.63.7
95-170, percent54.554.554.150.753.051.447.345.743.141.840.937.937.235.434.734.032.532.1U29.427.325.424.8
60-94, percent20.128.326.727.530.732.932.034.937.135.936.036.638.242.041.441.342.942.0U40.739.838.938.6
<60, percent14.06.56.211.47.66.711.412.013.314.915.417.917.416.618.718.819.220.9U24.728.030.631.3
Miles not reported6832,1407888577877711,040230226156123131140157139271193317U71152691868
Other freeways and expressway miles reported8,1467,0117,6187,8048,4108,4808,7728,8608,7968,9599,2429,78610,14310,44310,65910,83211,17510,942U10,73010,8966,41611,070
>220, percent3.73.85.34.83.43.33.22.62.83.12.72.42.11.91.51.61.41.4U2.22.22.22.5
171-220, percent9.59.412.79.88.78.78.78.18.17.17.68.37.66.05.05.55.15.1U5.65.35.05.7
95-170, percent59.560.658.154.754.758.554.353.650.750.548.645.745.544.743.042.342.541.6U39.036.135.133.4
60-94, percent18.122.720.920.426.325.227.129.031.631.533.335.037.439.640.140.540.640.4U39.139.439.638.6
<60, percent9.33.52.910.36.84.26.66.86.87.77.98.67.47.910.310.010.311.6U14.117.118.219.8
Miles not reported3191,8461,3771,1666175793972813531678281981088478152467U765573129714
Other principal arterials miles reportedN30,33738,59841,44444,49845,00944,88648,04547,89048,93150,01653,43156,83159,74361,06461,25962,58458,901U58,41960,23523,49160,483
>220, percentN9.212.512.411.812.112.912.513.212.913.312.712.211.811.111.411.611.4U13.012.712.013.5
171-220, percentN13.316.314.714.114.618.518.116.816.416.416.415.515.714.515.415.215.0U15.113.913.812.6
95-170, percentN55.050.847.248.949.545.345.245.145.746.146.746.847.244.945.845.845.1U42.742.240.639.1
60-94, percentN19.316.615.917.517.817.618.819.419.519.419.520.020.121.421.721.822.3U22.323.324.625.1
<60, percentN3.33.89.77.76.05.85.45.45.54.94.75.55.38.25.65.56.3U6.97.99.09.7
Miles not reportedN22,49814,49211,3528,4858,2098,2465,1545,4264,1263,4223,4402,8632,0641,7652,0301,9755,654U6,5634,9571,4256,278
Minor arterials miles reportedNNNNNNN45,18243,83047,65749,02154,12958,47358,69963,02064,28766,13466,068U66,92964,77063,20471,995
>220, percentNNNNNNN12.314.314.014.815.317.815.614.714.914.014.1U18.318.619.417.5
171-220, percentNNNNNNN14.619.319.118.619.118.418.017.317.016.716.1U19.019.018.818.1
95-170, percentNNNNNNN45.945.945.545.445.543.845.043.944.144.945.9U45.745.943.942.7
60-94, percentNNNNNNN16.612.614.114.414.113.114.513.914.414.914.5U14.413.714.417.5
<60, percentNNNNNNN10.77.87.26.86.07.06.910.19.69.59.3U2.62.83.64.2
Miles not reportedNNNNNNNNNNNNNNNNNNUNNNN
Collectors miles reportedNNNNNNN34,81929,72630,46832,49138,34943,61945,21053,23654,67357,19457,177U65,04361,70659,51271,581
>220, percentNNNNNNN20.128.828.129.328.931.928.426.726.924.823.9U31.330.932.128.2
171-220, percentNNNNNNN17.823.521.922.222.721.521.320.520.020.320.9U22.421.321.621.3
95-170, percentNNNNNNN38.234.136.836.036.034.037.037.738.239.740.0U37.338.637.339.0
60-94, percentNNNNNNN12.65.75.75.35.66.17.96.46.37.27.2U7.98.07.910.2
<60, percentNNNNNNN11.47.97.57.16.86.65.38.68.58.18.0U1.11.21.11.3
Miles not reportedNNNNNNNNNNNNNNNNNNUNNNN

KEY: N = data does not exist; U = data are not available.

NOTES

Numbers may not add to totals due to rounding.

This edition of this table is not comparable to previous editions due to a change in the categories of road conditions.

Data is reported as the International Roughness Index (IRI) in inches per mile. Lower IRI represents smoother riding roadways. For more information on the rating system, refer to National Cooperative Highway Research Program (NCHRP) report 20-24(37)G, Technical Guidance for Deploying National Level Performance Measurements, available at http://onlinepubs.trb.org/onlinepubs/nchrp/docs/NCHRP20-24(37)G_FR.pdf as of November 2011.

SOURCES

Rural major collector, urban minor arterial, and urban collector:

U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual Issues), table HM-63, available at http://www.fhwa.dot.gov/policy/ohpi/hss/index.cfm as of May 5, 2016.

All other categories except rural major collector, urban minor arterial, and urban collector:

U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual Issues), table HM-64, available at http://www.fhwa.dot.gov/policy/ohpi/hss/index.cfm as of May 5, 2016.

Updated: Tuesday, May 23, 2017