There are enough highway interchanges in Italy too.
Not every ground that is suitable for streets, is also suitable for living.
The cost between those both are not comparable.
Usage of land is (at least in Italy) carefully determined to fulfill societies needs. Most people prefer to live somewhere, where infrastrcture already exists instead of building up a ghost town without anything nearby.
There are enough highway interchanges in Italy too.
Not every ground that is suitable for streets, is also suitable for living.
The cost between those both are not comparable.
Usage of land is (at least in Italy) carefully determined to fulfill societies needs. Most people prefer to live somewhere, where infrastrcture already exists instead of building up a ghost town without anything nearby.