![]() However, if the data is available in the underlying automatic vehicle location systems (e.g., VehiclePosition timestamp) it is recommended that producers provide these optional fields when possible. Optional: This field is optional and is not required to be implemented by producers.Outside of these conditions, the field is optional. Conditionally required: This field is required under certain conditions, which are outlined in the field Description.Required: This field must be provided by a GTFS-realtime feed producer. ![]() ![]() ![]() The following values are used in the Required field: In GTFS-realtime v2.0 and higher, the Required column describes what fields must be provided by a producer in order for the transit data to be valid and make sense to a consuming application. Version 2.0 of the feed specification is discussed and documented on this site. A GTFS Realtime feed lets transit agencies provide consumers with realtime information about disruptions to their service (stations closed, lines not operating, important delays, etc.) location of their vehicles, and expected arrival times.
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