International Journal of Highway Engineering (한국도로학회논문집)

Korean Society of Road Engineers (한국도로학회)
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Effects of Snowfall Intensity on Freeway Travel Speed (Focused on Seohaean Freeway)

강설에 따른 고속도로 주행속도 변화연구 - 서해안고속도로를 중심으로 -

  • 홍성민 (한양대학교 교통공학과) ;
  • 오철 (한양대학교 교통물류공학과) ;
  • 양충헌 (한국건설기술연구원 도로연구실) ;
  • 전우훈 (한국건설기술연구원 도로연구실)
  • Received : 2011.09.17
  • Accepted : 2012.06.01
  • Published : 2012.08.15
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Abstract

PURPOSES : Adverse weather conditions such as heavy rain, heavy snowfall, and thick fog and so on have highly affect on the change in traffic conditions on the road. In particular, heavy snowfall causes capacity reduction as well as crash occurrence. This study investigated the effects of snowfall on speed on a freeway. METHODS : Vehicle detection systems data were matched with corresponding weather station data by regression analysis. RESULTS : The results show that the travel speed is reduced by 6.7% under little snowfall and by 12.8% under heavy snowfall. Regarding the speed variation, 8.7% and 114.7% increases are observed under little snowfall and heavy snowfall, respectively. It is also found that 1 cm increase in snowfall leads to 0.4% decrease in travel speed. In addition, the travel speed increases by 0.4% when the temperature increases by $1^{\circ}C$. CONCLUSIONS : It is expected that the outcome of this study will be useful in establishing more effective strategies for winter operations and road maintenance in practice.

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References

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