# Interoperability

> NTCIP, TMDD, and the work of getting agency systems to exchange data.

3 articles in this lane on ITS Feed.
Canonical: https://its-feed.com/topics/interoperability/

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- [Agency data in OpenStreetMap: the map has your stops, not your identifiers](https://its-feed.com/articles/transit-data-in-openstreetmap/): OpenStreetMap mappers have already placed most of the objects an agency wants to contribute, and placed them well. What the map lacks is the agency's own IDs, which is the one thing only the agency can supply. (Explainer, published 2026-08-27, updated 2026-08-28)
- [What intelligent transportation systems actually are](https://its-feed.com/articles/what-are-intelligent-transportation-systems/): Intelligent transportation systems is a broad label that hides a precise idea. What ITS covers, what it looks like on the street, and why 253 of the 304 standards in the national architecture are about nothing but getting data from one system to another. (Explainer, published 2026-07-13, updated 2026-08-21)
- [How buses talk to traffic lights: transit signal priority](https://its-feed.com/articles/transit-signal-priority/): Transit signal priority lets a late bus ask a traffic signal for a few more seconds of green. Here is the request-to-grant message chain, how it differs from emergency preemption, and how NTCIP 1211 lets mixed-vendor buses and controllers interoperate. (Explainer, published 2026-07-06)

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Source: ITS Feed, https://its-feed.com/topics/interoperability/
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