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A Study on the Relationship Between Road Design, Operating and Posted Speeds  

Kim, Yong-Seok (한국건설기술연구원 도로연구부)
Cho, Won-Bum (한국건설기술연구원 도로연구부)
Publication Information
Journal of Korean Society of Transportation / v.23, no.7, 2005 , pp. 35-42 More about this Journal
Abstract
Few studies have been carried out to find out the interaction of design speeds, operating speeds, and posted speeds though they have a complementary relationships. As an attempt to find the relationships, this study measured the speeds of the free flowing vehicles at four lane rural highways. In comparison of 95th percentile speeds and inferred design speeds determined from the road design manual with the geometric features of each sites, operating speeds were constantly higher than the inferred design speeds at the sites where the inferred design speed is under 110km/h. and the reverse situation was observed at the sites where the inferred design speed is over 130km/h. In the comparison of operating speeds and posted speeds. the range of the 85th percentile speeds at the sites where posted speeds is 80km/h was distributed from 95km/h to 110km/h. and the range was distributed from the 105km/h to the 120km/h at the sites where posted speeds is 90km/h. Multiple regression analysis was used to develop prediction equations for mean. 85th. and 95th percentile speeds at approach and curve midpoint locations. At the midpoint, only posted speeds influenced the mean, 85th. At the approach locations, the mean, 85th, 95th percentile speeds were influenced by posted speeds and length of the approach tangent.
Keywords
설계속도;주행속도;제한속도;주행속도 예측모형;
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  • Reference
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