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Mark images in Service Alerts as final - #651

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TransitApp:feature/image-in-alerts-adoption
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Mark images in Service Alerts as final#651
gcamp wants to merge 1 commit into
google:masterfrom
TransitApp:feature/image-in-alerts-adoption

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@gcamp

@gcamp gcamp commented Jul 29, 2026

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Summary

image, image_alternative_text and the TranslatedImage message have been in the spec since September 2021. This PR removes their experimental tag.

Type of change

GTFS Realtime

  • Specification Change

Proposed Discussion Period

7 calendar day (minimum)

Testing Details

  • Consumer(s): Transit
  • Producer(s): Metro Transit (Minneapolis), TransLink (Vancouver), MBTA (Boston), VTA (Bay Area), Mecatran.

One caveat on the consumer side: Transit parses both fields and can display the image alongside the alert, but it isn't enabled by default today — it has to be manually enabled for the image to be shown to riders. There's plans to show it by default in the future. In the list of producers, we currently only show Metro Transit and TransLink.

Minneapolis Vancouver
Capture d’écran, le 2026-07-29 à 13 39 26 Capture d’écran, le 2026-07-29 à 13 37 53

Proposal Update Tracker

Date Update Description
2026-07-29 Initial PR submission

Remove the experimental tag from Alert.image, Alert.image_alternative_text
and the TranslatedImage message, in both the .proto and reference.md.
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