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proposed 2 additional feed entity types: Stop and Trip
Modifications. These allow agencies to broadcast new detour paths of routes and new temporary stops. The change has been released to users in the Transit app across several agencies. On March 11, 2024, the proposal was merged and released by GTFS
617:
Alerts typically don't update as often as
Vehicle Positions or Trip Updates. Each Alert stores the cause (such as labour strike or a mechanical fault) of an incident, along with its effect (reduced service, detour, stop cancellation, etc.). Alerts also contain detailed headers, descriptions, urls,
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also contains the current latitude and longitude of the vehicle, and can also include bearing, odometer, and speed in m/s. Finally, it can also contain information on how crowded the bus is, known as occupancy status, and status of road congestion experienced by the vehicle.
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Integrated Travel
Project began validating GTFS Schedule and Realtime feeds published by municipality and county public transport agencies within California. Monthly reports are published on the errors in agency data, along with analysis of typical street speeds and traffic.
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A proposal that was created on July 28, 2015 and merged on Aug 15, 2015 allowed the combination of several feed entity types into a single feed. While the majority of agencies separate feed entity types (Vehicle
Positions, Trips, and Alerts), some feeds are still joined.
549:, typically every few seconds to minutes. Agencies typically refresh data in frequencies ranging between 1 second to 1 minute. There is no standard for streaming GTFS Realtime data, also support is built in to allow for deletion of items from previous iterations.
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Agencies supporting GTFS-Realtime typically provide separate urls for the three separate feed types, and may choose to only provide some of the feeds. Unlike GTFS Static, many agencies may require developers to request an API key via email or a web form.
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This feed contains an array of Trip
Updates. Each trip update enumerates a description of a trip (trip id, route id, start time and date, direction), last updated time, may include an associated vehicle number and route number, and contains an array of
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The GTFS Realtime specification is defined by a .proto file hosted by Google. Data is serialized into raw bytes by the server and then deserialized by a client. Officially supported GTFS-rt binding libraries have been built in
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On August 30, 2021, an experimental feed entity types, Shapes, was released. Shapes has the ability to update route shapes in real time to reflect detour, as route updates are either reflected by referencing an existing
618:
images, and a list of routes or stops affected (known as the
Informed Entity). Alerts specify their beginning and expiration times using "active periods". Alerts can be localised into several languages.
561:, a trip refers to an operator driving a fixed-route vehicle from the start of the route to the end. A new trip is started for when the vehicle turns around at the end of its route.
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The standard is used by public transport agencies globally, including the United States, Canada, most countries in the
European Union, United Kingdom, Australia, New Zealand, and in
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There are currently three official feed types defined in the standard, TripUpdates, VehiclePositions, and Alerts. Shapes, Trip
Modifications, and Stops are currently experimental.
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Alerts can be shown to mapping application users to alert them of detours, cancellations, or other service changes. This feed contains an array of
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can also contain a basic description of the trip, such as its trip id, start and stop times, route number, and relationship to the schedule. The
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can define past, current, and future stop times, delays, and cancellations. The stop id references the GTFS Schedule feed the agency provides.
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The Trip Update feed allows maps to show the departure or arrival times of vehicles, and allows routing algorithms to update their directions.
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Vehicle
Positions are sometimes shown on mapping applications to aid users in tracking the location of buses. This feed contains an array of
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448:(AVL) systems. Trip arrival times are computed using machine learning models that analyse historical positional data and timetables.
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agencies share real-time vehicle locations, arrival time predictions, and alerts such as detours and cancellations via
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752:"Allow multiple feed entity types in a single feed by egorich239 · Pull Request #7 · google/transit"
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On 22 August 2011, a first version of GTFS-rt was released by Google. This data was shown to
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Developers then write programs to periodically fetch an agency's web API over
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800:
776:"Cal-ITP unveils new open data standard to improve transit agency operations"
843:"Provide realtime trip information with TripUpdates - Transit Partners Help"
825:"transit/gtfs-realtime/proto/gtfs-realtime.proto at master · google/transit"
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452:
801:"GTFS Trip-Modifications by gcamp · Pull Request #403 · google/transit"
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703:"Know when your bus is late with live transit updates in Google Maps"
531:. Unofficial libraries have been written in other languages, such as
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Realtime location data is created continuously by an agency from
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or by defining in real time a new shape as an encoded polyline.
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728:"Google Maps Now Features Alerts On Subway Service Changes"
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MTA Subway GTFS-rt Alerts being posted on Transit App
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195:. Unsourced material may be challenged and removed.
636:"Reference - General Transit Feed Specification"
175:An editor has performed a search and found that
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16:Standard for real-time public transport data
53:Learn how and when to remove these messages
273:Learn how and when to remove this message
255:Learn how and when to remove this message
150:Learn how and when to remove this message
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497:In September 2023, Swiftly and the app
867:"Vehicle Positions | Realtime Transit"
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86:Please improve this article by adding
679:"Revision history | Realtime Transit"
7:
921:Public transport information systems
193:adding citations to reliable sources
891:"Service Alerts | Realtime Transit"
474:began showing alerts from GTFS-rt.
14:
659:Parkford, Stan (30 August 2021).
34:This article has multiple issues.
726:Del Signore, John (2012-07-31).
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42:or discuss these issues on the
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88:secondary or tertiary sources
360:Transit realtime data format
926:Scheduling (transportation)
181:to establish the subject's
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661:"How do predictions work?"
588:. Like Trip Updates, each
446:automatic vehicle location
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178:sufficient sources exist
931:Web syndication formats
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343:; 6 months ago
320:; 13 years ago
318:27 September 2011
75:relies excessively on
936:Computer file formats
895:Google for Developers
871:Google for Developers
683:Google for Developers
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429:) is an extension to
707:Official Google Blog
189:improve this article
941:Real-time computing
665:Swiftly Help Center
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847:support.google.com
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559:GTFS Specification
365:Extended from
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304:Filename extension
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470:In July 2012,
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140:February 2024
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898:. Retrieved
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850:. Retrieved
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808:. Retrieved
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784:. Retrieved
782:. 2022-06-07
780:Mass Transit
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759:. Retrieved
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643:. Retrieved
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187:Please help
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36:Please help
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472:Google Maps
465:Google Maps
433:, in which
389:Open format
915:Categories
900:2023-08-07
876:2023-08-07
852:2023-08-07
810:2023-12-07
786:2024-02-02
761:2023-12-07
737:2023-08-07
712:2024-02-02
688:2023-07-31
645:2023-07-31
622:References
521:Javascript
348:2024-03-11
325:2011-09-27
215:newspapers
183:notability
110:newspapers
77:references
39:improve it
732:Gothamist
491:CalTrans'
489:In 2022,
412:/realtime
397:CC BY 3.0
45:talk page
640:gtfs.org
506:Standard
484:shape_id
376:Standard
615:Alerts.
557:In the
499:Transit
467:users.
459:History
427:GTFS-rt
403:Website
346: (
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229:scholar
124:scholar
829:GitHub
805:GitHub
756:GitHub
601:Alerts
572:. The
527:, and
525:Python
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395:Yes,
236:JSTOR
222:books
131:JSTOR
117:books
547:HTTP
533:Rust
517:Java
513:.NET
431:GTFS
410:.org
408:gtfs
208:news
103:news
339:2.0
309:.pb
191:by
79:to
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
