[radu_floricica]

There _are_ other ways. Less efficient and arguably more expensive, but for completeness sake they should be mentioned.

For example, build infrastructure that favor sprawling. This way people will prefer to live in nicer, smaller towns as long as they're still 30 minutes train ride from the city. (I'm in Paris now, and their RER is an awesome example of this.)

Encourage remote work, or at least don't hinder it.

Test some anti-car measures, like congestion taxes or just make whole neighborhoods car free. This makes commute time less directly proportional to physical distance - if you have to walk 10 minutes or take a train either way, you're more ok with living in a suburb.