Model split also has it's downsides. For example:
Not every trip is the same in every country. Denmark commutes 22km on average, the Netherlands does 3km
Not every country travels as far. Someone who does 10km by train out of 100km has a much greater share than 20km out of 10.000.
That moment when you look around for the most competent person, and come the sad conclusion that it's you