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Characteristics and Modeling of Operating Speed at Horizontal Curves on Rural Four-Lane Highways  

고종대 (삼성교통안전문화연구소)
장명순 (한양교통시스템공학과)
정준화 (한국건설기술연구원)
Publication Information
Journal of Korean Society of Transportation / v.20, no.7, 2002 , pp. 95-105 More about this Journal
Abstract
Under a specific roadway alignment condition by design-speed standards, safety of the roadway is determined by an actual operating speed of a driver. This research takes first lanes of four-lane(hi-direction) rural highways as target facility. It also takes the straight and curved lanes of the selected highways for in-depth study. This study used NC-97 to detect speeds of passenger cars whose speeds are not affected by front vehicles. This research analyzed properties of 85th percentile operating speed at upstream of horizontal and through curves under various alignment conditions. The results show that 53∼65 Percent of drivers drive faster than the posted speed-limit (80KPH) by 14∼20 KPH on average. It also shows that the 85th-percentile operating speeds are the lowest at the middle point of curve length when curve radius is smaller. However, they are lowest at 1/4 point of curve length when curve radius is greater. Along roadways where curve radius is small, difference between upstream speed and the speed along the curve is considerably large. On the other hand. the speed difference is setting smaller as the curve radius is increasing. According to the results, significant variables affecting the 85th percentile operating speeds are curve radius and the 85th-Percentile operating speeds of upstream curves.
Keywords
설계속도;주행속도;곡선반경;제한속도;모형;
Citations & Related Records
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