Level of Service (LOS) indicates the operational efficiency of traffic facilities. The method recommended by Highway Capacity Manual (HCM) for signalized intersections uses control delay as the service measure and does not incorporate users’ perception. As LOS is a measure of customer satisfaction, it is important to incorporate users’ perceptions into it. This paper attempts to evaluate the influence of user’s vehicle class on perceived LOS at signalized intersections under heterogeneous traffic conditions. An extensive user perception survey involving approximately 8500 users in motorized two wheelers, three wheelers, cars, and buses at 15 signalized intersections across India populates the database. From the model results, it has been concluded that along with perceived waiting time, other perception-related factors have significant effect on the users’ perceived LOS. The findings highlight the necessity of incorporating qualitative parameters in LOS analysis in addition to the conventional service measure (i.e. delay).

中文翻译：

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不同交通条件下信号交叉口的感知服务水平

服务水平 (LOS) 表示交通设施的运营效率。公路通行能力手册（HCM）为信号交叉口推荐的方法使用控制延迟作为服务措施，不考虑用户的感知。由于 LOS 是衡量客户满意度的指标，因此将用户的感知纳入其中非常重要。本文试图评估在异构交通条件下用户车辆类别对信号交叉口感知 LOS 的影响。数据库中包含一项广泛的用户感知调查，涉及大约 8500 名驾驶两轮车、三轮车、汽车和公共汽车的用户，这些用户位于印度 15 个信号灯交叉路口。从模型结果可以得出结论，随着感知等待时间，其他感知相关因素对用户的感知服务水平有显着影响。调查结果强调了在 LOS 分析中加入定性参数的必要性，以及传统的服务措施（即延迟）。