If you were to drive from Usti nad Labem to Tegel airport you just get on the motorway and stay there. It does help if you join it going north.
At some point you’ll insist that you’ve missed it. Bugger, and just how bloody big is Berlin anyway?
It’s at exactly that point on the road that the Germans start putting up the little signs saying “This Way to Tegel”.
Clever people the Huns.