  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.
