isabelle-dr

**Comment by [barbeau](https://github.com/barbeau)** _Dec 11, 2021_ ---- Recommendations for providing TripUpdates for next trip in block was adopted in PR google/transit#206, so I'm removing the spec clarification label.

**Comment by [barbeau](https://github.com/barbeau)** _Feb 05, 2019_ ---- So it seems that TripUpdate.delay may have been intended to represent "schedule deviation", i.e., the observed past value for how ahead/behind schedule the...

**Comment by [minhhpham](https://github.com/minhhpham)** _Feb 07, 2019_ ---- From an analysis through transitfeeds.com. There are 24 agencies that use StopTimeUpdate.delay and none use TripUpdate.delay. Here are the 24 agencies: ## FEED...

**Comment by [barbeau](https://github.com/barbeau)** _Feb 07, 2019_ ---- @minhhpham Thanks! And how many feeds total? I assume the remainder use at least StopTimeUpdate time fields.

**Comment by [barbeau](https://github.com/barbeau)** _Mar 22, 2019_ ---- As mentioned in opentripplanner/OpenTripPlanner#2733 (comment), the spec currently states: > At least one stop_time_update must be provided for the trip unless the trip.schedule_relationship...

**Comment by [kurtraschke](https://github.com/kurtraschke)** _Mar 22, 2019_ ---- Before `TripUpdate.delay` existed, there was [a field](https://github.com/OneBusAway/onebusaway-gtfs-realtime-api/blob/38e50b4cc35027eb41b09836c75f9a917e400918/src/main/resources/com/google/transit/realtime/gtfs-realtime-OneBusAway.proto#L49) in the OBA GTFS-realtime extension for TripUpdate-level delay. The intention was (as far as I'm aware)...

**Comment by [barbeau](https://github.com/barbeau)** _May 25, 2019_ ---- > As to the spec language quoted above, ("Delay should only be specified when the prediction is given relative to some existing schedule...

**Comment by [barbeau](https://github.com/barbeau)** _May 12, 2018_ ---- This is also related to the broader question of whether vehicle entities should be included in GTFS-rt feeds for non-revenue trips - I...

**Comment by [nselikoff](https://github.com/nselikoff)** _May 23, 2018_ ---- We asked our Google Transit contact whether to include vehicle entities for non-revenue trips and received this response: > "Regarding cases where the...

**Comment by [barbeau](https://github.com/barbeau)** _May 23, 2018_ ---- @nselikoff Thanks for the info! So is Google implying that they may display non-revenue vehicles on the map if they are in the...