Sensitivity of Traffic Speed to Rainfall

IF 1.9 4区 地球科学 Q3 ENVIRONMENTAL STUDIES Weather Climate and Society Pub Date : 2022-09-14 DOI:10.1175/wcas-d-22-0024.1
K. Salvi, Mukesh Kumar, A. Hainen
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Abstract

Hazardous weather conditions can pose threat to functioning of transportation systems. While the impacts of extreme weather events (e.g., hurricanes/tornadoes and flooding) on transportation disruptions have received significant attention, minor transient disturbances in traffic and transport systems due to rainfall events have remained understudied. Given that a road network experiences rainfall events on a regular basis, which in turn likely reduces its efficiency through short-term disruptions, it is imperative to assess the influence of variations in rainfall intensity on the traffic speed. By synergistically using crowdsourced probe vehicle speed data and spatially-explicit meteorological data, this study quantifies the sensitivity of traffic speed to rainfall events of different intensities over 1,151 road sections within Alabama. It is observed that instead of variations in the rainfall intensity, traffic speed sensitivity is primarily influenced by road section’s free-flow speed (uninterrupted speed during dry-pavement conditions) and antecedent traffic volume. Relative sensitivity of road sections exhibits high consistency over different rainfall intensities across all road sections, thus underscoring the possibility of assessing sensitivities based only on speed data collected during rainfall intensities that are much more frequent. These results may be used to identify road sections and time periods with high sensitivity to rainfall, thus helping in prioritization of mitigation measures.
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交通速度对降雨的敏感性
危险的天气条件可能对运输系统的运行构成威胁。虽然极端天气事件(如飓风/龙卷风和洪水)对交通中断的影响受到了极大的关注,但降雨事件对交通和运输系统的轻微瞬态干扰仍然研究不足。鉴于道路网经常发生降雨事件,这反过来可能会通过短期中断降低其效率,因此必须评估降雨强度变化对交通速度的影响。通过协同使用众包探测车辆速度数据和空间显式气象数据,本研究量化了阿拉巴马州1151个路段的交通速度对不同强度降雨事件的敏感性。据观察,交通速度敏感性主要受路段自由流速度(路面干燥条件下的不间断速度)和前期交通量的影响,而不是降雨强度的变化。路段的相对灵敏度在所有路段的不同降雨强度下表现出高度一致性,因此强调了仅根据在更频繁的降雨强度期间收集的速度数据来评估灵敏度的可能性。这些结果可用于确定对降雨高度敏感的路段和时间段,从而有助于确定缓解措施的优先顺序。
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来源期刊
Weather Climate and Society
Weather Climate and Society METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
3.40
自引率
13.60%
发文量
95
审稿时长
>12 weeks
期刊介绍: Weather, Climate, and Society (WCAS) publishes research that encompasses economics, policy analysis, political science, history, and institutional, social, and behavioral scholarship relating to weather and climate, including climate change. Contributions must include original social science research, evidence-based analysis, and relevance to the interactions of weather and climate with society.
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