[okusername]

You should visit Europe once, you'll see that life here is different.

Specifically regarding Friedrichstraße: It's in the city center, brimming with tourists. 3 major subway lines have stops there. Few cars drive in there as it is, because you have bigger streets nearby that are better connections. If you still want to go with your car, you just park in a parallell side street, there are even parking garages if you don't want to look for a spot.

Having it car free will be lovely for the tourists, cafés and restaurants will put out tables.

The same was done in other city centers like Budapest or Vienna decades ago, and it worked out extremely well for everyone involved.