It is impossible to specify a different arrival_time and departure_time in a GTFS-RT trip modification object

[miklcct]

Describe the problem

I want to specify a vehicle on a detour journey which has an extended stop at a station to make up time. It is impossible to do so in a GTFS-RT trip modification object.

Use cases

There is a bus which runs along stops A to G. However, a roadwork has forced the bus to skip these stops, so it has to run on a more direct route with an interchange at X. The bus will have an extended layover at X such that it will run on the original static time in the unaffected section, and to allow as many passengers as possible to change there for alternative journeys.

Proposed solution

To allow specifying both arrival and departure times in trip_modifications

Additional information

No response

[eliasmbd]

@miklcct Thank you for posting your first issue here on the google/transit, the official GTFS repository. My name is Elias, and I am the GTFS community manager working for MobilityData. I am sure the community will be able to get back to you as soon as possible.

In the meanwhile, I encourage you to join the official GTFS slack, there you can connect with other community members. This issue was shared there for extra visibility.

[gcamp]

@miklcct do you have suggestion on how to design this into the current Trip Modification object? I understand your need but not your proposed solution.

[miklcct]

There is a field called travel_time_to_stop in the ReplacementStop object. It only specifies the arrival time at the replacement stop relative to the reference stop. If we can add a layover field (in seconds, default 0) in the object it can show a separate departure time as well.