An interesting experiment would be that if you pay for parking at the city edge, your parking stub can act as a (family pass?) transit ticket.
Though I think the parking is usually free, in contrast with parking in the city centre.
The parking is free and the bus fee is € 6 for two-way to the center, and addtionally for all lines in the city within an hour of parking or leaving.
An interesting experiment would be that if you pay for parking at the city edge, your parking stub can act as a (family pass?) transit ticket.