I'm based in Denmark. And thanks for the detailed explanation. I've never really worked with public transit data before, but it seems like there are quite a few interesting possibilities for personal projects, especially with GTFS/GTFS-RT.
This is well made, would love to have this in my own country as I can never trust the actual timers on the bus stops.
How do you get access to the data? Is it a public government API? How did you manage to map all the routes too?