United States Department of Transportation
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Developing Georgia’s High Friction Surface Treatment (HFST) Program - HFST Site Characteristics (HFST-SC) Data Collection and Analysis
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2018-04-01
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[PDF-14.59 MB]
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Edition:Final; June 2015 – April 2018
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Abstract:The Georgia Department of Transportation (GDOT) has invested millions of dollars in the high friction surface treatment (HFST) and will continue investing more to reduce potential run-off-road (ROR) crashes on sharp curves. GDOT has taken the initiative to work with Georgia Tech's research team to improve its HFST program. An enhanced HFST-SS method was developed to systematically and proactively select HFST sites. The method consists of three steps: 1) analyze crash data and assign it to segments, 2) prioritize and select segments/corridors for application of HFST considering and balancing crash frequency, severity ratio, and wet crash conditions, and 3) use BBI values to select curve sites for HFST application. A procedure, including a geo-database and an HFST report card (HFST-RC), was developed for collecting, processing, integrating, visualizing, and analyzing the before and after HFST-Site Characteristics (HFST-SC); these characteristics were collected using emerging sensing technologies (including 2D imaging, lasers, 3D LiDAR, Inertial Measurement Units (IMU), and GPS/GIS technologies). The detailed-level, location-referenced HFST-SC data, including a) curve information, such as curve location, radius, point of curvature (PC), and point of tangent (PT), b) superelevation and vertical slope, c) posted speed, and d) the presence of other curve treatments, such as signs and chevrons, on 31 miles of State Route 2, were collected. The change in the site characteristics before and after HSFT-SC was analyzed using the developed procedure. A case study using the sensing data collected on State Route 2 has demonstrated the capability of the proposed procedure to collect, process, visualize, and analyze detailed, location- referenced HFST-SC data and to document the data changes, which will support subsequent analyses and safety studies. The preliminary study, using the detailed level location-referenced HFST-SC on State Route 2, was conducted, and results show that vertical grades (greater than 4%) play an important role on the ROC near a curve when the BBI values are the same; thus, a sharp vertical grade could be used as an additional factor for HFST site selection. Additional study using a large data set is recommended to support the preliminary findings.
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