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derhuerst / hafas-gtfs-rt-feed

Format HAFAS data as GTFS Realtime.
https://github.com/derhuerst/hafas-gtfs-rt-feed#hafas-gtfs-rt-feed
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support GTFS-ServiceChanges v3.1, once finalised & accepted #9

Open derhuerst opened 2 years ago

derhuerst commented 2 years ago

The GTFS-ServiceChanges v3.1 proposal contains a several sub-proposals:

GTFS currently cannot describe some real-time service changes that can happen on public transit networks. This proposal offers different improvements to the current specification to handle different use cases:

  • GTFS-TripUpdates v3 extends GTFS-TripUpdates to change values on a trip object, either by directly providing the new values (e.g. new trip headsign or new trip short name) or by referencing another entity already defined in the (CSV) GTFS (e.g. a shape, a route, or platform). The only limitations being that no stop time can be added, and all stop_id and stop_sequence pairings in the TripUpdate must match the same GTFS static trip (it is allowed to have SKIPPED stops within a TripUpdate, as the stop_sequence for the stops do not change).
  • GTFS-NewTrips allows defining completely new trips in real-time, which is useful for replacement shuttles, unplanned event-specific shuttles, or detours that change the stop_sequences of a trip. The new trips may be either scheduled-based or frequency-based.
  • GTFS-NewShapes allows adding new shapes in real-time, which is useful, for example, when a road is closed and therefore the path of the vehicle won’t be the same as planned, or when a trip is shortened by having an early terminus.
  • GTFS-NewRoutes allows adding new routes in real-time, which is useful, for example, when a bus replacement shuttle does the same trip as the service it’s replacing, but with a bus.
  • GTFS-NewStops allows adding new stops in real-time, which is useful when a bus replacement shuttle stops at a street corner without bus stop, or when a stop is moved for unplanned reason (e.g. demonstration, road accident, emergency work). GTFS-NewStops must be used with GTFS-NewTrips - new stops cannot be used in TripUpdates.
  • GTFS-ServiceUpdates allows activating or deactivating service in real-time, which is useful for disabling or enabling many trips at the same time, such as planned services for unexpected occasions (e.g: snow bus routes, light-rail diversion in case of demonstration downtown).
  • GTFS-FrequencyUpdates allows changing headways and service span in real-time, which is useful for modifying frequency-based services when unexpected events occur, requiring either more or less services than usual.