The HERMES project

HERMES - "Harmonisation of European Routine and Research Measurement Equipment for Skid Resistance of Roads and Runways" - is a co-operative pre-normative research conducted by FEHRL - Forum of European National Highway Research Laboratories - that aims at harmonising skid resistance measurement methods at European level. One of its main task is to investigate the reliability and feasibility of a draft standard proposed by CEN - European Committee for Standardization - that defines a common scale (so-called "EFI - European Friction Index") for a tyre/road friction coefficient and specifies the procedure for calibrating measuring devices based on that scale. This paper reports and analyzes the results of field trials involving 15 different friction measuring devices and 7 different texture measuring devices that took part in 9 rounds of comparison exercises on 61 test surfaces in 5 countries. Based on these results, several improvements in the definition of EFI and in the data processing method are proposed in order to optimize the consistency and precision of the calibration procedure. It is concluded that the improved procedures provide a stable, common scale of friction but that the reproducibility standard deviation of the EFI-values delivered by the different devices remains too large to be considered satisfactory.

Language

  • English

Media Info

  • Pagination: 11p

Subject/Index Terms

Filing Info

  • Accession Number: 01389581
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Aug 23 2012 3:35AM