Impact of Inclement Weather on Dilemma Zone Boundaries

Adverse or inclement weather events, such as snowfall, impact the traffic efficiency, traffic safety, and trip distribution. Inclement weather is reported to be the prime causal factor for fatal two vehicle crashes. Weather-based signal control strategies have the potential to enhance both the operational efficiency and the safety at a signalized intersection. This paper reports on an empirical study to model the impacts of inclement weather (snow, and rain) on driver decision making at the onset of yellow at a high speed signalized intersection. In this research, the data were collected for a variety of weather conditions at a high speed intersection at Noblesville, Indiana. The impact of inclement weather on probability of stopping was assessed by developing binary discrete choice models for different weather conditions. The model parameters for snow and rain condition were found to be statistically significantly different from normal day in more than 90% of the cases. The impact of snow on dilemma zone boundaries was more pronounced than rain.


  • English

Media Info

  • Media Type: DVD
  • Features: Figures; Maps; Photos; References; Tables;
  • Pagination: 22p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01154472
  • Record Type: Publication
  • Report/Paper Numbers: 10-2356
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 11:05AM