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                        Case Study: Kentucky Transportation Cabinet's High Friction Surface Treatment and Field Installation Program


            
            In This Section
        Pavement Friction
                Friction Management
                Continuous Pavement Friction Measurement (CPFM)
                Traditional Friction Treatments
                High Friction Surface Treatment
                Case Studies and Noteworthy Practices
                FAQs, Links, and Other Resources
                
                SECTION 5: Data Collection and Analysis in Support of the HFST Program
SECTION 5: Data Collection and Analysis in Support of the HFST Program

This section discusses the data collection and analysis used for site selection and monitoring after HFST placement to assess the impact on crashes and HFST friction characteristics.

5.1 HFST Post-installation Crash Analysis

To assess the value of HFST, KYTC performed a post-installation crash analysis. The latest HFST crash analysis, conducted in October 2013, included 43 uniquely identified HFST installations on ramps and horizontal curves that were constructed between July 2009 and October 2012. Since the post HFST installation time frame is not adequate in length to perform a more rigorous analysis, a simple 3 year "before" installation to 1 to 4 years "after" installation7 crash comparison was performed. For horizontal curve installations yearly wet crash averages declined by 86 percent, yearly dry crash averages declined by 47 percent, and yearly total crashes declined by 73 percent. For ramp installations yearly wet crash averages declined by 85 percent, yearly dry crash averages declined by 66 percent, and yearly total crashes declined by 78 percent.

Two sets of pie charts. The first set of pies reflects the percentage of decrease in yearly crashes after HFST installation on horizontal curves. Pies show an 86 percent in wet crashes, a 47 percent decrease in dry crashes, and a total decrease of 73 percent. The second set of pies shows the percentage of decrease in yearly crashes after HFST installation on ramps. Pies show an 85 percent decrease in wet crashes, a 66 percent decrease in dry crashes, and a 78 percent overall decrease.

5.2 HFST Post-installation Friction Monitoring

As part of KYTC HFST post-installation assessment, there was interest in testing pavement friction on the HFST installations. KYTC conducts friction measurements with a conventional locked wheel skid trailer, but does not perform network-level friction testing. Friction testing is conducted for special requests and materials assessments. The majority of the HFST sites are in sharp horizontal curves, which are not conducive to testing with the locked wheel skid trailer.

KYTC selected the Dynamic Friction Tester (DFT) as the pavement friction testing device for HFST assessment. The Kentucky Transportation Center (KTC) was selected to provide the DFT testing services and prepare a written report. The DFT is a portable device that is suitable for testing pavement friction, but requires a lane closure. Friction data is collected in the inner and outer wheel paths as well as between the wheel paths. Testing is conducted at three locations per site: the beginning, the middle, and the end of the HFST installation. KTC personnel also document pavement distress and take photographs of each site. Unpublished reports documenting the testing conducted in 2012 and 2013 were developed. Some sites have little to no distress, while others display some raveling of the HFST aggregate and delamination of the epoxy-resin. Existing pavement transverse and longitudinal cracking have reflected through the HFST, which is expected. No moisture-trapping-related distresses have been observed. DFT values are consistent for most of the projects and are considered adequate. In 2012, the first year of DFT testing, approximately 80 sites were tested.
      
  Book traversal links for SECTION 5: Data Collection and Analysis in Support of the HFST Program
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                    SECTION 6: Contracting and Constructing HFST ›
                
                Book:Case Study: Kentucky Transportation Cabinet's High Friction Surface Treatment and Field Installation Program
              Acknowledgements
                Technical Report Documentation Form
                Executive Summary
                SECTION 1: Introduction
                SECTION 2: Brief History of High Friction Surface Treatments and Their Benefit
                SECTION 3: Kentucky's HFST Program
                SECTION 4: HFST Site Selection Process
                SECTION 5: Data Collection and Analysis in Support of the HFST Program
                SECTION 6: Contracting and Constructing HFST
                SECTION 7: Project Examples of HFST Application
                References U.S. DEPARTMENT OF TRANSPORTATION

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