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Development of a delay model for unsignalized intersections applicable to traffic assignment

机译：开发适用于交通分配的无信号交叉路口的延迟模型

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This paper develops a model for estimating unsignalized intersection delays which can be applied to traffic assignment (TA) models. Current unsignalized intersection delay models have been developed mostly for operational purposes, and demand detailed geometric data and complicated procedures to estimate delay. These difficulties result in unsignalized intersection delays being ignored or assumed as a constant in TA models. Video and vehicle license plate number recognition methods are used to collect traffic volume data and to measure delays during peak and off-peak traffic periods at four unsignalized intersections in the city of Tehran, Iran. Data on geometric design elements are measured through field surveys. An empirical approach is used to develop a delay model as a function of influencing factors based on 5- and 15-min time intervals. The proposed model estimates delays on each approach based on total traffic volumes, rights-of-way of the subject approach and the intersection friction factor. The effect of conflicting traffic flows is considered implicitly by using the intersection friction factor. As a result, the developed delay model guarantees the convergence of TA solution methods. A comparison between delay models performed using different time intervals shows that the coefficients of determination, R2, increases from 43.2% to 63.1% as the time interval increases from 5- to 15-min. The US Highway Capacity Manual (HCM) delay model (which is widely used in Iran) is validated using the field data and it is found that it overestimates delay, especially in the high delay ranges.
机译：本文开发了一种用于估计无信号交叉路口延误的模型，该模型可应用于交通分配（TA）模型。当前的无信号交叉路口延误模型主要用于运营目的，并且需要详细的几何数据和复杂的程序来估计延误。这些困难导致在TA模型中无信号交叉延迟被忽略或假定为常数。视频和车牌号码识别方法用于收集交通量数据，并测量伊朗德黑兰市四个未信号交叉口的交通高峰和非高峰时段的延误。几何设计元素的数据通过现场调查进行测量。使用经验方法根据5分钟和15分钟的时间间隔开发延迟模型，将其作为影响因素的函数。拟议的模型基于总交通量，主体进近的通行权和交叉路口摩擦因数估算每种进近的延误。通过使用交叉路口摩擦因子隐式考虑交通流冲突的影响。结果，开发的延迟模型保证了TA解法的收敛性。使用不同时间间隔执行的延迟模型之间的比较显示，随着时间间隔从5分钟增加到15分钟，确定系数R2从43.2％增加到63.1％。使用现场数据验证了美国高速公路通行能力手册（HCM）延迟模型（在伊朗广泛使用），发现该模型过高估计了延迟，尤其是在高延迟范围内。

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