Evaluating Curve Speed Behaviour Using SHRP 2 Data

The first objective is to assess the transferability of the speed prediction models that were developed using Texas data. The second objective is to find whether driver familiarity has any relationship with the speeds on horizontal curves. The following tasks will be performed to accomplish these objectives. (1) Obtain speed profiles of drivers in Indiana as they traverse through approach tangents and subsequent curves from the National Data Service (NDS) data. (2) Compare the observed speed profiles to predicted speed profiles obtained from (i) the model that was calibrated in Texas Department of Transportation (TxDOT) project 0-5439 to estimate tangent speed as a function of speed limit and curve radius and (ii) the models that were calibrated in TxDOT project 0-6714 to estimate curve beginning and ending point speeds as a function of the midpoint speed and other curve variables. (3) Use the observed and predicted speeds to assess the severity of the curves (using the friction-based and energy-based criteria from TxDOT project 0-5439) and examine how the severity categories compare with crash frequency data from the same curves. (4) Identify any relationship between speeds and the frequency that the given driver traverses the curve or road of interest. This task will identify the difference in speeds along the curve of a familiar driver when compared with an unfamiliar driver. The research team plans to use speed profiles from the existing data as the NDS vehicles traversed through approach tangents and curves. It is envisioned to collect the data stream that start at about 15 seconds’ travel time upstream of the curve beginning and end after the vehicle passes the curve ending. The team would also use the Roadway Information Database (RID) geometry and crash data as needed. The project team has access to all the data needed for accomplishing the study objectives. Importance of Project: This research effort would strengthen the understanding of curve traffic operations and the relationship between curve speed choice and safety. Specifically, this effort will assess the transferability of both curve speed models and the methods to assess curve severity, which in turn can be used to diagnose and prioritize curve sites for safety treatments.

  • Record URL:
  • Supplemental Notes:
    • Contract to a Performing Organization has not yet been awarded.


  • English


  • Status: Active
  • Funding: $72078
  • Contract Numbers:


  • Sponsor Organizations:

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Project Managers:

    Geedipally, Srinivas

  • Principal Investigators:

    Geedipally, Srinivas

  • Start Date: 20161017
  • Expected Completion Date: 20170831
  • Actual Completion Date: 0
  • USDOT Program: University Transportation Centers Program

Subject/Index Terms

Filing Info

  • Accession Number: 01617756
  • Record Type: Research project
  • Source Agency: Center for Advancing Transportation Leadership and Safety (ATLAS Center)
  • Contract Numbers: DTRT13-G-UTC54
  • Files: UTC, RiP
  • Created Date: Nov 28 2016 9:57AM