Naolib Real-Time Transit Feeds: SIRI Adopted, GTFS-RT Dark

🤖 AI-generated summary of the sources below · 🔎 Last verified 2026-08-10 · ◆ 1 sourced claim, none individually verified yet

This overview was generated with AI from the public sources listed below and checked against them before publication. It has not had a complete human fact-check — treat it as a starting point and follow the sources.

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Semitan, the mixed-economy company that runs Nantes's tramways, busways and buses for Nantes Métropole, has published a real-time arrivals API as open data since November 2013 under ODbL — the same API that drives the official TAN app. From late 2024 the operator moved to the French SIRI profile 2.0, exposing CheckStatus, Stop Monitoring and Situation Exchange services, and announced that the legacy JSON API would no longer be maintained from December 2025. Alongside the real-time services Nantes Métropole publishes GTFS, NeTEx stops and NeTEx offer files, plus GBFS feeds for four separate shared-mobility operators. The metropolis explicitly tells reusers to prefer SIRI over GTFS-RT, because SIRI carries more of the disruption model.

Live 📅 since 2013

Outcome🔄 Ongoing

Evidence📊 Independent

what does this mean?

The strongest source is an independent non-academic evaluation: an audit office, a government or EU review, or an NGO. It grades who did the looking — not how well the project went. All four grades →

Run bySemitan (Société d'économie mixte des transports en commun de l'agglomération nantaise), for Nantes Métropole

Scale🗺️ Regional

📊 Impact

transport.data.gouv.fr, the French national access point that monitors declared mobility feeds, reports the Naolib SIRI and SIRI-Lite endpoints at 100% availability and both GTFS-RT resources — service alerts and trip updates — at 0%, unavailable since 4 July 2026, with 40 consecutive notifications sent to the producer as of 10 August 2026. The static GTFS and NeTEx files are available and were refreshed in early August 2026.

🎓 Lesson

Standardising on the national format is defensible, but the feed that international journey planners actually consume is the one that is dark, and it has stayed dark for more than a month of automated warnings. Both real-time endpoints also sit behind an API key, so 'open' here means registered rather than anonymous access — a distinction the licence label does not make.

🚲 Mobility Public transport Open data Sensors & IoT

Sources

↗ transport.data.gouv.fr — Réseau urbain Naolib archived copyThe French national access point's dataset page and API (dataset id 685d9000ec5a7481ab634360). Publisher Nantes Métropole, licence Licence Ouverte 2.0. Its monitoring reports SIRI and SIRI-Lite at 100% and both GTFS-RT resources at 0% / 'Non disponible' with 40 consecutive notifications since 4 July 2026; the API returns is_available:false for both GTFS-RT resources and true for SIRI, SIRI-Lite, GTFS and NeTEx (checked 10 August 2026).

↗ data.gouv.fr — API temps réel de la TANThe legacy Semitan real-time API: created on data.gouv.fr 16 November 2013, ODbL, JSON, listing stops, waiting times and schedules, and described as the API behind the official TAN mobile app. Source for the 2013 start year.

↗ Open Data Nantes Métropole — Services d'informations en temps réel Naolib au format SIRIPublisher Semitan, ODbL. Documents the SIRI France profile 2.0 implementation and the three services exposed (CheckStatus, Stop Monitoring, Situation Exchange), with further services announced.

↗ Open Data Nantes Métropole — Horaires en temps réel Naolib (API JSON), notice de remplacementCarries the deprecation notice: from December 2025 the historical real-time datasets are no longer maintained and are replaced by the SIRI services, with the recommendation to prefer SIRI over GTFS-RT.

Continue exploring

Compare this project

🇫🇮 HSL Open Transit Data & the Digitransit Platform · Helsinki Both operators opened real-time APIs early. Helsinki's grew into Digitransit; Nantes retired its 2013 API for the French SIRI profile. 🇵🇹 Carris Real-Time Bus & Tram Tracking · Lisbon Two European operators publishing real-time feeds; Nantes shows what the national monitoring platform sees when one format silently stops. 🇫🇷 Cycle Counting Loops and Their Published Failure Rate · Nantes Two Nantes mobility feeds whose publisher documents their limits — here, which counter was faulty that day.

Explore the wider context

🔑 Your Smart City Is Owned by Someone Else 🚌 Public transport guide 🏙️ Nantes city profile 🚲 Mobility projects 📖 GTFS (General Transit Feed Specification)📖 Open data 📖 Urban data platform (UDP)

📎 Cite this project

1001 Smart Cities (2026). “Naolib Real-Time Transit Feeds: SIRI Adopted, GTFS-RT Dark” — Nantes, France. The Smart City Atlas. https://1001smartcities.org/projects/nantes-naolib-realtime/ (last verified 2026-08-10). Data: CC BY 4.0.

The underlying data is free to reuse with attribution — see the open data page.

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