Urban transit bus idling is a contributor to ecological stress, economic inefficiency, and medically hazardous health outcomes due to emissions. The global accumulation of this frequent pattern of undesirable driving behavior is enormous. In order to measure its scale, we propose GRD-TRT- BUF-4I (Ground Truth Buffer for Idling) an extensible, realtime detection system that records the geolocation and idling duration of urban transit bus fleets internationally. Using live vehicle locations from General Transit Feed Specification (GTFS) Realtime, the system detects approximately 200,000 idling events per day from over 50 cities across North America, Europe, Oceania, and Asia. This realtime data was created to dynamically serve operational decision-making and fleet management to reduce the frequency and duration of idling events as they occur, as well as to capture its accumulative effects. Civil and Transportation Engineers, Urban Planners, Epidemiologists, Policymakers, and other stakeholders might find this useful for emissions modeling, traffic management, route planning, and other urban sustainability efforts at a variety of geographic and temporal scales.

翻译：城市公交车辆怠速行为会因排放物导致生态压力、经济效率低下及危害健康的医疗后果。这种频繁发生的不良驾驶模式在全球范围内累积影响巨大。为量化其规模，我们提出了GRD-TRT-BUF-4I（怠速地面实况缓冲系统）——一个可扩展的实时检测系统，用于记录全球城市公交车辆的地理位置与怠速时长。该系统利用通用交通数据规范实时版提供的实时车辆位置数据，每日从北美、欧洲、大洋洲和亚洲的50多个城市中检测约20万起怠速事件。创建此实时数据旨在动态支持运营决策与车队管理，以在怠速事件发生时降低其频率与持续时间，同时捕捉其累积效应。土木与交通工程师、城市规划师、流行病学家、政策制定者及其他相关方可将此数据用于排放建模、交通管理、路线规划及其他多时空尺度的城市可持续发展工作。