LTPP Data Analysis: Guidelines to Improve Use of FWD and Longitudinal Profile Measurements

Pavement deflections obtained from falling weight deflectometer (FWD) measurements and roughness obtained from longitudinal profile measurements are used together with other measurements to assess pavement condition and performance. These measurements are influenced by the temporal and/or diurnal variations; their consideration is necessary for accurate assessment of pavement condition. The Long-Term Pavement Performance Program (LTPP) Seasonal Monitoring Program (SMP) was initiated to obtain data on the influence of temporal variations on pavement deflection and roughness. However, the temporal and diurnal data contained in the LTPP database (see Special Note A) have not been applied to improve the practices of measuring deflection and roughness, and their use has not been demonstrated. Also, recent work completed under NCHRP Project 20-50(22), “LTPP Data Analysis: Feasibility of Using LTPP data to improve Use of FWD and Longitudinal Profile Measurements” identified some of the issues related to the use of FWD and longitudinal profile measurements and proposed a preliminary research plan for addressing these issues (see Special Note B). However, additional research is needed to further define and address the issues associated with the effects of temporal and diurnal variations on FWD and longitudinal profile measurements, and to develop guidelines to improve these measurements and their use in evaluating pavement condition. The objective of this research is to develop guidelines for improved use of FWD and longitudinal profile measurements data in evaluating pavement condition by considering the effects of temporal and/or diurnal variations. The research shall address both asphalt and concrete pavements and focus on using the data available in LTPP database (including those for SMP test sections).


  • English


  • Status: Active
  • Funding: $350000
  • Contract Numbers:

    Project 20-50(22)A

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Hanna, Amir

  • Performing Organizations:

    Nichols Consulting Engineers

    1885 S. Arlington Avenue
    Suite 111
    Reno, NV  United States  89509
  • Principal Investigators:

    Pierce, Linda

  • Start Date: 20211116
  • Expected Completion Date: 20240215
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01766930
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-50(22)A
  • Files: TRB, RIP
  • Created Date: Mar 15 2021 9:16PM