High Friction Surface Treatment

High Friction Surface Treatment

HFST Road

Crashes on the nation’s roadways continue to be one of the leading causes of fatalities and major injuries in the United States, particularly in rural areas. Roughly half of all fatal crashes occur at intersections or on horizontal curves. In horizontal curve crashes, it is often the case that the vehicle speed and curve geometry create a “friction demand” higher than what can be achieved with standard pavement surfaces. Intersection crashes often occur when driver error creates an unexpected need for increased friction demand to serve as a “speed countermeasure.”

 

 

One low cost approach that has been shown to be effective in addressing high “friction demand” locations is the installation of a High Friction Surface Treatment (HFST). High Friction Surface Treatments are pavement surface treatments that are composed of extremely hard, polish- and abrasion-resistant aggregates bonded to the pavement surface that greatly enhance the skid resistance and frictional characteristics of a road surface. HFSTs address three speed-related crash conditions: low friction, marginal friction (further reduced by weather), and friction values not compatible with approach speeds and geometrics.

 

 

ATSSA's High Friction Surface Treatment Council (member login required) works to assist policymakers so they can better understand the impact of friction demand on roadway safety and the role that high friction surfacing can play to improve safety at high-risk locations. Council members also aim to provide the latest information related to high friction surface treatments that will be the most helpful in the ongoing effort to create a safer driving environment for all motorists.

Resources

Part 1. Volume 7, Section 3 (HD 28/04)

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This Standard describes how the provision of appropriate levels of skid resistance for trunk roads will be managed. It details how measurements of skid resistance are to be made and interpreted and is complemented by HD 36 (DMRB 7.5.1), which sets out advice on surfacing material characteristics. This latest revision has changed requirements for setting investigatory levels, for annual SCRIM surveys, for determining the characteristic SCRIM coefficient and has further updates in line with current policy

Some U.K. Developments in Skid-Resistant Road Surfaces. Lamb, DR 1977

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The paper discusses various types of skid-resistant treatment appropriate for different categories of road. For particularly critical areas such as junctions in cities, treatments based on epoxy resin binders and calcined bauxite have proved highly effective in maintaining skid-resistance and reducing accidents.

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