Abstract Travel times and hence accessibility in urban areas are susceptible to traffic disruption caused by events such as congestion, roadworks and traffic accidents. Being highly valued by travellers, travel time reliability affects their participation in activities and thus, plays a decisive role in accessibility. The aim of the study was to develop an approach to integrate travel time reliability into the measurement of accessibility. To achieve this, we extended a commonly-used accessibility indicator to include day-to-day variability in travel times. In a case study of the accessibility to the newly-built Queen Elizabeth University Hospital (QEUH) in Glasgow, we used real-time travel times with high temporal resolution collected over a long period of time to demonstrate the applicability and the utility value of this approach compared to the standard accessibility measurement. Our results revealed that travel time reliability varied both temporally and spatially, and zones experienced relatively high levels of accessibility loss due to higher travel time variability. The proposed approach provides a more realistic representation of actual network performance, allows for assessing the effect of travel time reliability on accessibility throughout the day and will help transport planners to trace equity impacts on accessibility due to travel time unreliability.

中文翻译：

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动态可达性：将日常旅行时间可靠性纳入可达性测量

摘要 城市地区的出行时间和可达性容易受到拥堵、道路工程和交通事故等事件造成的交通中断的影响。旅行时间可靠性受到旅行者的高度重视，影响他们参与活动，因此对可达性起着决定性作用。该研究的目的是开发一种方法，将旅行时间可靠性整合到可达性的测量中。为了实现这一目标，我们扩展了一个常用的可访问性指标，以包括旅行时间的日常变化。在格拉斯哥新建的伊丽莎白女王大学医院 (QEUH) 可达性的案例研究中，我们使用在很长一段时间内收集的具有高时间分辨率的实时旅行时间来证明这种方法与标准可达性测量相比的适用性和实用价值。我们的结果表明，旅行时间可靠性在时间和空间上都有所不同，并且由于旅行时间可变性较高，区域经历了相对较高的可达性损失。所提出的方法提供了对实际网络性能的更真实的表示，允许评估旅行时间可靠性对全天可达性的影响，并将帮助交通规划者追踪由于旅行时间不可靠性对可达性的公平影响。由于较高的旅行时间可变性，区域的可达性损失相对较高。所提出的方法提供了对实际网络性能的更真实的表示，允许评估旅行时间可靠性对全天可达性的影响，并将帮助交通规划者追踪由于旅行时间不可靠性对可达性的公平影响。由于较高的旅行时间可变性，区域的可达性损失相对较高。所提出的方法提供了对实际网络性能的更真实的表示，允许评估旅行时间可靠性对全天可达性的影响，并将帮助交通规划者追踪由于旅行时间不可靠性对可达性的公平影响。