Tom Scott did a video[1] on it last summer. They have a working version in a test tower in Germany, but have not installed it in an actual for-public-use buildi

Tom Scott did a video[1] on it last summer. They have a working version in a test tower in Germany, but have not installed it in an actual for-public-use building yet and I'm unsure if testing phases have been completed [1]: https://www.youtube.com/watch?v=kdTsbFS4xmI https://www.youtube.com/watch?v=kdTsbFS4xmI