Using Traffic Speed Deflection Data (TSD) for Pavement Evaluation

Traffic Speed Deflection Data (TSD) can be used to collect deflection data due to a rolling wheel at 80 km/h at network level. It measures vertical deflection velocity using a Doppler laser and slope is calculated by dividing vertical velocity by vehicle velocity. The deflection is calculated using the Euler-Bernoulli equation. Since Falling Weight Deflectometer (FWD) data cannot be collected over the whole state highway network, TSD is being studied as an alternative. Data has been collected on I-70, US-54, US-83, US-183, US-281 and K-156. The 2015 FAST Act (Pub. L. No. 114-94) encourages agencies to assess interstate investments need on a corridor basis. Data collected by TSD is uniquely suited for the task of collecting network-level data. TSD has demonstrated sensitivity for gathering information on pavement structure. Such data also has been useful in pavement design support and some possible applications have been studied by TxDOT. Currently TSD information is also collected by the Kansas Turnpike Authority on its network. They have agreed to participate in this study. The objectives of this research are to make use of the KDOT and KTA collected TSD data for pavement evaluation. The following tasks are preliminarily proposed: (1) Use the various TSD quantities of interest, and the associated viewing tools, to assess the subsurface condition of KDOT pavements in order to validate TSD data with other tools for evaluating pavement structure and substructure (e.g. FWD, DCP, Cores, etc); (2) Use time sequenced TSD data collection effort to estimate the rate of pavement deterioration and thus predict Remaining Service Life (both structural and functional) KTA Interstate corridors and estimate rehabilitation needs. For KDOT pavements where only a single data set exists, estimation of Remaining Service Life will be based on the method proposed by Gedafa et al. (2010)*; (3) Pending the outcomes of Task 2, explore the feasibility of using of TSD data, and the associated Remaining Service Life Estimation, to assist in project selection for both KTA and KDOT sections; and (4) Explore the feasibility of using TSD data to assess subsurface deterioration. *Gedafa, D.S., Hossain, M., Miller, R. and Van, T. Estimation of the Remaining Service Life of Flexible Pavements from Surface Deflections. ASCE Journal of Transportation Engineering, Vol. 136, No. 4, April 2010, pp. 342-352.


    • English


    • Status: Active
    • Funding: $78219
    • Contract Numbers:



    • Sponsor Organizations:

      Kansas Department of Transportation

      Eisenhower State Office Building
      700 SW Harrison Street
      Topeka, KS  United States  66603-3754
    • Performing Organizations:

      Kansas State University Transportation Center

      Kansas State University
      Department of Civil Engineering
      Manhattan, KS  United States  66506
    • Principal Investigators:

      Hossain, Mustaque

      Jones, Christopher

    • Start Date: 20230615
    • Expected Completion Date: 20250415
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01894614
    • Record Type: Research project
    • Source Agency: Kansas Department of Transportation
    • Contract Numbers: KSU-23-1, RE-0858-01
    • Files: RIP, STATEDOT
    • Created Date: Sep 26 2023 11:35AM