The Polished Stone Value of aggregates and in-service skidding resistance

  • Published: TRL, 1998
  • Authors: P. G. Roe and S. A. Hartshorne
  • Date Added: 06 Mar 2013
  • Last Update: 25 Oct 2016
  • Format: html


To determine the relationship of in-service roads to the polishing resistance of aggregates and the level of traffic using such roads.


The study compared an analysis of skidding resistance measurements from in-service roads. This was supported by some limited laboratory studies of extended polishing. A database was established in phases to cover as extensive a range of aggregates, site categories and traffic levels as was practical. This was used to consider models for predicting skidding resistance from PSV and traffic data.

A series of laboratory studies of polishing was then carried out to investigate some of the phenomena observed in the field data. Initial investigations of alternative PSV test regimes for small-particle size materials were also made. The interpretation of the results was supported by a background desk-top review of earlier research on the topic.

Key Findings:

  • At present, PSV (Polished Stone Value) is the only parameter relating to the microtexture properties of an aggregate which can be measured in a standardised manner and which has been related to traffic and site conditions. It therefore remains an appropriate property to use in specifications, provided that its limitations are recognised.


Skid Resistance


Informative UK-based research.