GTFS Real-time - missing fields

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Mark

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May 30, 2022, 12:09:29 AM5/30/22
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Hello,

Full disclaimer: I'm relatively new to working with GTSF feeds, so this is a pretty newbie question I'm sure.

My agency's GTFS feed is consistently providing feed entities that do not include a trip_id field, occupancy status, etc. The entity looks like this:

entity {
  id: "131586"
  vehicle {
    position {
      latitude: 48.687896728515625
      longitude: -123.41217803955078
      bearing: 199.0
      speed: 0.0
    }
    timestamp: 1653882216
    vehicle {
      id: "9395"
      label: "9395"
    }
  }
}

This represents a good chunk (maybe 10%) of entities in the feed. I have checked using other sources that this entity is currently in service on a route.

Before I reach out to the agency and cause a hassle, has anyone had experience with these types of issues before? I just want to make sure I'm not missing something super obvious or a known reason for this missing data.

Sean Barbeau

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May 31, 2022, 3:39:08 PM5/31/22
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Hi,
VehiclePositions without trip or route info could be vehicles not currently providing passenger-facing service (e.g., dead-heading to garage).

10% sounds like a lot though.

You could run the feed through the GTFS Realtime Validator and see if it throws a lot of errors to get a sense of quality:

Sean

Sean Barbeau
Center for Urban Transportation Research
University of South Florida

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