Evaluate Methodology to Determine Localized Roughness

The Texas Department of Transportation implements a smoothness specification based on inertial profile measurements. This specification includes a localized roughness provision to locate defects on the final surface based on measured surface profiles. To identify defects, the existing methodology uses the deviations between the average of the left and right wheel path profiles, and its moving average as determined using a 25-ft base length. Stations where the deviations exceed 150 mils in magnitude are considered defect locations. While this methodology provides an objective approach for evaluating localized roughness based on profile data, some districts have introduced an additional step to determine the need for corrective work. Specifically, these districts have used a bump rating panel to select, from among the defects identified using the existing procedure, those bumps and dips that will require correction based on the panel’s opinion of the severity of the defects from a ride quality point of view. Clearly, a standard methodology needs to be developed so that consistency in ride quality assurance testing can be maintained. Otherwise, differences in results of quality assurance tests between projects within a district and between districts can easily arise because of differences in road user perception of ride quality. Consequently, this project examined the existing methodology for evaluating localized roughness to develop recommendations for an improved methodology that engineers can use to objectively decide where corrective work is necessary so as to maintain consistency in quality assurance testing of pavement smoothness.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Technical Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 68p

Subject/Index Terms

Filing Info

  • Accession Number: 01596756
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/TX-14/0-6610-2, 0-6610-2
  • Contract Numbers: 0-6610
  • Created Date: Apr 11 2016 12:31PM