The project was shared as part of a talk at Graz Linux Tage. You can find it here, unfortunately it is only available in German
https://media.ccc.de/v/glt26-688-c-its-mit-einem-esp32-ampel...
https://media.ccc.de/v/glt26-688-c-its-mit-einem-esp32-ampel...
>To improve coverage, we need your support! We have built a board with *ESP32-C5* and *PoE* that allows you to capture *C-ITS* packages yourself, and provide us for our face-up card, or process it yourself.
Edit: found it, https://codeberg.org/opentrafficmap