Evaluation of Tyregrip High-Friction Surfacing - Final Report

This report describes the installation of Tyregrip®, a high friction surface, on a high crash location to reduce crash rates.
Tyregrip® is a thin polymer overlay system that uses a two part epoxy binder and calcined bauxite aggregate. Postconstruction
friction resistance results in the middle to high 70’s indicate that the Tyregrip® has improved the friction
properties of the crash prone ramp.

The study was terminated in May of 2016 due to the delamination of the Tyregrip® high friction surface after a service
life of five years. The friction resistance of the Tyregrip® remained in the low to high 70’s throughout the five year evaluation
period. The wet surface crash rate was reduced by 79% as compared to the five years prior to the installation of the Tyregrip®.
It was concluded that Tyregrip® is a viable mitigation strategy for roadways with high rates of run-off-the-road crashes. It
was recommended that Tyregrip® and other high friction surface treatments be considered for locations with high rates of wet
weather run-off-the-road crashes.

Publication Date: 
Monday, April 24, 2017
Publication Number: 
WA-RD 788.2
Last modified: 
07/18/2017 - 10:53
Keith W. Anderson, Mark Russell, Justin Sheets, David Burkey, Michael Southwick, Jeff S. Uhlmeyer, Jim Weston.
Washington State Department of Transportation. State Materials Laboratory.
Number of Pages: 
Overlays (Pavements), Surface treating, Friction materials, Skid resistance, Wet weather, High risk locations, Ran off road crashes, Hazard mitigation, Surface course (Pavements), Evaluation and assessment, Recommendations.