Maintenance agencies are looking for a relatively inexpensive device that can measure roadway friction under winter conditions and will tell the snowplow operator in real time whether there is friction present or not. This method would assist the operator in determining when and where abrasives and/or chemicals are required to be applied during snow and ice control operations under all conditions. There have been studies that utilized braking action friction measurements as an indicator. However, this method cannot be used during high traffic volume conditions. Field studies have been conducted at NASA Wallops Flight Facility and in Iowa, Minnesota, Michigan and Norway using Norsemeters Roar and later SALTAR to determine applicability of the equipment to snow & ice operation, reliability, and durability. The measuring device is mounted on a snowplow and the measurement is achieved by employing wheel braking to 100% and then measuring the braking friction force that the road surface exerts against the wheel when the wheel spins up. Each measurement uses a viable slip speed measurement and record peak friction, slip at peak friction and the friction verses slip shape factor. Data was collected concerning precipitation, pavement condition, pavement temperature, air temperature, speed of the measuring device and the friction values. The equipment, measurement procedures and findings are described in detail. This preliminary research study shows that the different contaminant conditions can be separated and the friction level can be evaluated to determine whether or not to salt, salt light or salt heavy. Also, a supervisor can evaluate the effectiveness of abrasives and/or chemicals applied.


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 143-152

Subject/Index Terms

Filing Info

  • Accession Number: 00801067
  • Record Type: Publication
  • ISBN: 2840601311
  • Files: TRIS
  • Created Date: Oct 23 2000 12:00AM