And public transport here is so expensive. For a return trip, it is cheaper, and faster, to take a car (both petrol and parking costs). The only thing that taking public transport saves you is the hassle of traffic (so you can do something else on your ride), and parking, which can be real bad in some areas of the city.

The S-Bahn and U-bahn are usually only crowded on peak hours (2 or 3 hour intervals in the morning and evening).