Texas IRI Summary, 2000–2005

This paper reports the results of statistical analysis done in order to evaluate International Roughness Index (IRI) on Texas roads from 2000 to 2005. Analyses were done on Asphalt Concrete Pavement (ACP), Continuously Reinforced Concrete Pavement (CRCP) and Jointed Concrete Pavement (JCP) roads. IRI results from Interstate Highways (IH), United States (US) Highways, State Highways and Farm to Market (FM) roads with and without surface treatments are reported separately. For FM roads, differences in IRI as measured in the left and right wheelpaths are also reported. Reductions in IRI resulting from overlaying CRCP and JCP concrete pavements are summarized. Statistical analyses indicate that the mean IRI data as measured in the left and right wheelpaths of roads using automated inertial profilers are log-normally distributed. The riding quality of roads in Texas has improved over the last five years partly because of the introduction of new ride quality specifications. IRI as measured in the right wheelpath is consistently higher than that measured in the left - in particular for FM roads with surface treatments suggesting non-traffic related influences on these roads. ACP generally have the lowest IRI values (highest ride quality) followed by CRCP and then JCP. Results of the analyses are used to recommend research strategies to improve the ride quality of Texas roadways. Findings suggest that significant improvements in the overall ride quality of the Texas roadway network can be achieved by focusing efforts on FM roads with surface treatments and overlaying JCP.

• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Mikhail, Magdy Y
  • Prozzi, Jorge A
  • Smit, Andre de Fortier
  • Haggerty, Brett
  • Rand, Dale
• Conference:
  • Transportation Research Board 85th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2006-1-22 to 2006-1-26
• Date: 2006

Language

• English

Media Info

• Media Type: CD-ROM
• Features: Figures; References; Tables;
• Pagination: 1p.
• Monograph Title: TRB 85th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

• TRT Terms: Asphalt concrete pavements; Concrete pavements; Continuously reinforced concrete pavements; Farm roads; Interstate highways; Ride quality; Surface treating
• Identifier Terms: International Roughness Index
• Geographic Terms: Texas
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 01029360
• Record Type: Publication
• Report/Paper Numbers: 06-2790
• Files: TRIS, TRB
• Created Date: Jul 21 2006 2:34PM