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ESTIMATION OF CRITICAL HEADWAY AT SMALL URBAN ROUNDABOUT

机译：小城市环形交叉路口临界探测

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摘要

Before choosing an intersection project design, an important step is to examine the justification of the construction on the basis of defined criteria. One of the key criteria is the analysis of capacity. Large numbers of roundabout capacity models are present in the world, most of them adapted to the conditions of the country they originate from and they need to be calibrated for local conditions. Key parameters for calibration are critical headway and follow-up headway. Follow-up headway can be measured directly in the field, while critical headway cannot be measured, but is estimated. Many critical headway estimation methods exist (over 30) and each of them provides different values. Different values of critical headway result in different capacity estimation values. This raises the question which method provides more realistic estimations under certain conditions. In this paper, four most frequently used critical headway estimation methods (Raff, Maximum likelihood method, Wu, Logit) were selected to be tested by comparison of theoretical capacity models and actual measured capacity at a small urban roundabout.
机译：在选择交叉路口项目设计之前，重要的一步是根据规定的标准来检查施工的理由。关键标准之一是对能力分析。世界上存在大量环形交叉路口容量模型，其中大多数适应他们源自的国家的条件，他们需要校准当地条件。校准的关键参数是临界通道和随访。随访前往可以直接在现场测量，而无法测量临界前沿，但估计。存在许多关键前进方法（超过30），其中每个都提供不同的值。临界前沿的不同值导致不同的容量估计值。这提出了该问题在某些条件下提供了更现实的估算。在本文中，选择了四种最常用的关键前进估算方法（RAFF，最大似然法，吴，Logit）进行测试，以通过比较小城市环形交叉路口的理论容量模型和实际测量容量进行测试。

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