지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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PURPOSES : Capacity is a main factor of determining the number of lane in highway design or the level of service in road on operation. Previous studies showed that breakdown may occur before capacity is reached, and then it was concluded that capacity is a stochastic value rather than a deterministic one. In general, estimating capacity is based on average over maximum traffic volume observed for capacity state. This method includes the empirical distribution method(EDM) and would underestimate capacity. This study estimated existing empirical methods of estimating stochastic highway capacity. Among the studied methods are the product limit method(PLM) and the selected method(SM). METHODS : Speed and volume data were collected at three freeway bottleneck sites in Cheonan-Nonsan and West Sea Freeway. The data were grouped into a free-flow state or capacity state with speeds observed in the bottlenecks and the upstream. The data were applied to the empirical methods. RESULTS : The results show that the PLM and SM estimated capacity higher than EDM. The reason is that while the EDM is based on capacity observations only, the PLM and SM are based on free-flow high volumes and capacity observations. CONCLUSIONS : The PLM and SM using both free-flow and capacity observations would be improved to enhance the reliability of the capacity estimation.
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참고문헌 (5)
참고문헌 신청
Korea Highway Capacity Manual / 2013 / Ministry of Construction & Transportation
Michiel M. Minderhoud / 1997 / Assessment of Roadway Capacity Estimation Methods / Transportation Research Record: Journal of the Transportation Research Board (1572):59~67
Matt R. Lorenz / 2001 / Defining Freeway Capacity as Function of Breakdown Probability / Transportation Research Record: Journal of the Transportation Research Board (1776):43~51
Lily Elefteriadou / 1995 / Probabilistic Nature of Breakdown at Freeway Merge Junctions / Transportation Research Record: Journal of the Transportation Research Board (1484):80~89
Zhe Sun / 2011 / Development of Extreme Value Distirbution Method for Estimation of Expressway Capacity / Transportation Research Record: Journal of the Transportation Research Board (2260):133~139
Michiel M. Minderhoud / 1997 / Assessment of Roadway Capacity Estimation Methods / Transportation Research Record: Journal of the Transportation Research Board (1572):59~67
Matt R. Lorenz / 2001 / Defining Freeway Capacity as Function of Breakdown Probability / Transportation Research Record: Journal of the Transportation Research Board (1776):43~51
Lily Elefteriadou / 1995 / Probabilistic Nature of Breakdown at Freeway Merge Junctions / Transportation Research Record: Journal of the Transportation Research Board (1484):80~89
Zhe Sun / 2011 / Development of Extreme Value Distirbution Method for Estimation of Expressway Capacity / Transportation Research Record: Journal of the Transportation Research Board (2260):133~139
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