Table 1-3 Condition of the U.S. Highway System: 2000, 2011, 2013, and 2014
Tuesday, February 14, 2017
Highway surface condition
| 2000 | 2011 | 2013 | 2014 | |
|---|---|---|---|---|
| Percent of mileage with International Roughness Indexa over 170 (poor condition) | ||||
| Rural Routes | ||||
| Interstates | 2.1 | 1.8 | 2.4 | 2.2 |
| Other principal arterials | 4.0 | 3.2 | 4.9 | 3.8 |
| Minor arterials | 7.0 | 6.6 | 7.2 | 7.2 |
| Collectors | 22.1 | 18.6 | 19.7 | 20.3 |
| Urban Routes | ||||
| Interstates | 6.5 | 5.2 | 5.1 | 5.4 |
| Other freeways and expressways | 10.9 | 7.8 | 7.2 | 8.5 |
| Other principal arterials | 30.0 | 28.1 | 25.8 | 26.3 |
| Minor arterials | 33.7 | 37.3 | 38.2 | 36.1 |
| Collectors | 52.3 | 53.7 | 53.7 | 49.8 |
a International Roughness Index values are based on objective measurements of pavement roughness. A low IRI represents a smooth riding roadway.
NOTE: 2010 highway surface condition data are unavailable, thus 2011 was used.
SOURCE: U.S. Department of Transportation, Federal Highway Administration, as reported in U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics, table 1-27 (Highway surface condition). Available at www.bts.gov as of May 2016.