This report documents the research performed under NCHRP Project 1-43 It describes the work activities undertaken in the study and presents the results of those activities toward the development of the Guide for Pavement Friction The information provided in this report serves as the basis for many of the guidelines and recommendations contained in the Guide The information will be of interest to highway materials, construction, pavement management, safety, design, and research engineers, as well as others concerned with the friction and related surface characteristics of highway pavements Using information collected through detailed literature reviews and surveys/interviews with state highway agencies, this report discusses a variety of aspects regarding pavement friction It describes and illustrates the importance of friction in highway safety, as well as the principles of friction, as defined by micro-texture and macro-texture It identifies the factors affecting friction and examines the ways that friction can be measured (equipment and procedures) and expressed (reporting indices) Most importantly, it presents valuable information on (a) the management of friction on existing highway pavements and (b) the design of new highway surfaces with adequate friction This information focuses on techniques for monitoring friction and crashes and determining the need for remedial action, as well as identifying combinations of aggregate (micro-texture) and mix types/surface texturing methods (macro-texture) that satisfy friction design requirements The report includes various conclusions and recommendations based on the results of the study, and it features five appendixes containing supplemental information on friction

Guide for Pavement Friction

The inter-vehicle separation during vehicle following is one of the most critical parameters of the automated highway system (AHS), as it affects both safety and highway capacity. The trade-off between capacity and safety gives rise to a variety of different AHS concepts and architectures. In this study we consider a family of AHS operational concepts. For each concept we calculate the minimum inter-vehicle spacing that could be used for collision-free vehicle following, under different road conditions. For architectures involving platoons we also use the alternative constraint of bounded energy collisions to calculate the minimum spacing that can be applied if we allowed collisions at a limited relative velocity in case of emergency stopping. The minimum spacing is used to calculate the maximum possible capacity that could be achieved for each operational concept.

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Spacing and capacity evaluations for different AHS concepts

Heavy truck deceleration rates as a function of brake adjustment

Braking Performance of Heavy U.S. Vehicles

Tractor and Trailer Brake System Compatibility

This volume consists of Appendices A through G which provide detailed vehicle information and test data that supports the technical report (Volume 1)

R W Radlinski

Papers

Nhtsa heavy duty vehicle brake research program report no. 1--stopping capability of air braked vehicles volume 2--appendices