content name:
  It is widely accepted that poor skid resistance on road surfaces is related to an increased risk of accidents, especially in wet conditions. If a more consistent approach to skid resistance policies is to be encouraged across Europe, then greater consistency of measurement is also needed, which might be achieved by harmonising the various techniques currently used in different countries. Also, some form of harmonisation is needed to meet the requirements of CEN for future work on test methods for assessing road surfacing materials. There has been a considerable amount of research into the possibilities for harmonising skid resistance measurements over the years and Task 2.1 of the TYROSAFE project has included a review of the state of the art. The review has focussed on work relating to measurements on roads but similar work for measuring friction characteristics on airfields has been included so that any cross-over of ideas could be taken into account. The review has noted that there are various ways of approaching the problem. The concept of harmonisation has been described as "the definition of a common scale, against which measurements from different sources or standards based on different measurement types can be compared and understood" or "the adjustment of the outputs of different devices used for the measurement of a specific phenomenon so that all devices report the same value(s) (i.e. report in a common scale), except for some inaccuracy". However, it has also been recognised that if the inaccuracy, or imprecision, of a harmonised scale is too great for practical purposes (and what is acceptable may vary with different purposes), it may not be possible to harmonise measurements. Ultimately, standardisation might prove to be a better technical solution for a particular purpose. TYROSAFE aims at the definition of a "common scale" for skid resistance measurements, either through harmonisation or standardisation. The main purposes for harmonised skid resistance measurements envisaged in this review have been either for acceptance of new road surfacings or for in-service network monitoring and maintenance planning. While formal harmonisation may not be necessary for measurements made for research, (including accident investigation), there is potential relevance to these fields also, since it is likely that researchers or accident investigators might wish to understand their data in the context of conditions on the wider road network. This review has concentrated on the harmonisation of measurements made in wet conditions: the frictional properties of roads affected by ice or snow or contaminants other than water are outside its scope. The review considered a range of experimental studies into the problem of harmonisation, which has been addressed to various degrees for many years. The main effort over the last fifteen years or so has included three major studies, leading to proposals for harmonised indices: the PIARC International experiment which led to the IFI (International Friction Index); the HERMES experiment which assessed the proposed EFI (European Friction Index) and a study on airfields that led to the IRFI (International Runway Friction Index). There have also been numerous smaller exercises which have considered alternative approaches or attempted to test or validate these ideas in some specific situations.
content link: http://tyrosafe.fehrl.org/index.php?m=49&mode=download&id_file=7305
content language: English
English summary: no
If you want to rate, please register or log in.
user comments  
This content is related to:
project type
area of interest
user type
road authorities/owners 
research labs 
city authorities 
Other similar contents:

The similarity algorithm calculates how much two contents in the system are similar to one another. So far, similarity is calculated based on similarity of the project type, area of interest and user type. Generally, if two contents have more parameters in common they are more similar to each another. More information.

content description similarity (%)
created: Marco Conter, 14.07.2010 15:03:22
last modified: Marco Conter, 14.07.2010 15:56:59