A Spatially Compatible Rainfall -- Speed Analysis

Rainfall reduces visibility and traction, both of which are crucial to safe driving behavior. One behavioral change that has historically received attention is a change in driving speed due to rainfall. This paper investigates light rainfall’s impact on uncongested speed during the daytime on a two lane state highway with a detailed statistical analysis and spatially compatible rainfall and speed data. The results show that the speed distribution in light rain conditions is significantly different from the no-rain condition. Light rain causes a drop of 0.9 mph (1.5 km/hr) or 1.8% of speed from the no-rain condition. Variability of speed is not found significantly different between the two conditions. These findings suggest that the operational impacts of weather are indeed significant, though perhaps less straightforward than previously thought.


  • English

Media Info

  • Media Type: DVD
  • Features: Figures; Photos; References; Tables;
  • Pagination: 15p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01152296
  • Record Type: Publication
  • Report/Paper Numbers: 10-3923
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 12:00PM