List of real FlixBus routes in Poland. I've tried to select lines that are possible to replicate considering available cities and roads (connection between Wrocław and Łódź is missing the most). I've included links in the file - by clicking on the name of the parter you can see a list of its vehicles, and by selecting photos you can see the buses used on the line.

https://drive.google.com/file/d/132ZmSQXQRkh7pLrQBo2LxWcL5NgCFqOO/view?usp=sharing

List of real FlixBus routes in Denmark. I didn't include lines that use ferry connections, as they are not available in the game.

https://drive.google.com/file/d/1b7l4W9TCK86qxAiKFOHqe2gr1mLdQaTy/view?usp=sharing