SEAHC Demonstration Projects
Under the FHWA Surface Enhancements At Horizontal Curves (SEAHC) effort, demonstration projects have been installed in eight states to date to determine the effect of HFS on reducing crash rates on horizontal curves. The states participating in this effort identified specific horizontal curves with high crash rates that could benefit from the installation of HFS, and installations have been completed in Summer 2009 through Summer 2011.
Completed SEAHC Demonstrations
Projects shown in the map include all projects tested under the SEAHC Program. Projects which were both installed and tested under the SEAHC Program are described in more detail below.
Colorado SEAHC Demonstration Projects
HFS Product Information
The SEAHC HFS demonstrations in Colorado were completed by Crafco, Inc. using the HFS product listed below:
- Product Name: Crafco HFS system
- Epoxy Type: Epoxy resin
- Aggregate Type: Crushed flint
Kansas SEAHC Demonstration Projects
HFS Product Information
The SEAHC HFS demonstrations in Kansas were completed by POLY-CARB, Inc. using the HFS product listed below:
- Product Name: POLY-CARB FLEXOGRID
- Epoxy Type: Epoxy resin/polyamine solution (MARK-177)
- Aggregate Type: Crushed flint
Montana SEAHC Demonstration Projects
HFS Product Information
The SEAHC HFS demonstrations in Montana were completed by POLY-CARB, Inc. using the HFS product listed below:
- Product Name: POLY-CARB FLEXOGRID
- Epoxy Type: Epoxy resin/polyamine solution (MARK-177)
- Aggregate Type: Crushed flint
North Carolina SEAHC Demonstration Projects
HFS Product Information
The SEAHC HFS demonstration in North Carolina was completed by Total Maintenance, LLC and Ennis Paint, Inc. using the HFS product listed below:
- Product Name: Tyregrip
- Epoxy Type: Highly Modified Epoxy Resin
- Aggregate Type: Calcined Bauxite
Testing of SEAHC Demonstrations
For each SEAHC HFS installation, friction and texture testing were conducted on the existing pavement surface just before application of the HFS material, and on the finished surface immediately following HFS application.
The following tests were conducted at each site:
- Dynamic Friction Tester (ASTM E 1911)
- Circular Track Meter (ASTM E 2157)
- GripTester (ASTM E 1844 / BS7941)
- Volumetric Macrotexture Depth (“Sand Patch” – ASTM E 965)
- RoboTex Texture Measurement (ISO 13473)
Tests were conducted in the right wheelpath and center of the lane at 2-4 locations per site, depending on the section length. The same tests will be conducted again at each site approximately one year after the HFS was installed.
FAQ for FHWA SEAHC Demo Projects
How can we help you with high friction roads?
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