Did you know that in Bavaria, it is illegal to run a service station’s car wash on Sunday?
Apparently, this falls under the category of disturbing the peace. Equally apparently, the coin-operated industrial-strength vacuum cleaners do not disturb the peace.
I learned this where the six-lane A9 autobahn deposits its traffic onto the eight-lane Mittlerer Ring, about a hundred meters from the crossing with the six-lane Leopoldstrasse. A very peaceful spot indeed.