Today happened to see in an exhibition a photo of the old times:
Something struck me: It explains very well a concept, that I am so familiar with: The Britons call it “pavement”, we call it “Gehsteig”. Others call it “sidewalk”.
The pictures shows a street, some parts of the street are paved 
Voilà, the pavement. Said paving puts them a bit above the general surface, voilà, the “Steig”
And when on the pavement, you’re walking along the side of the road. Voilà, “sidewalk”.
I guess in that time streets got paved on their edges to make people’s shoes happy. Perhaps the people in the unpaved part wearing boots ;)
Besides these people and the tram in the unpaved (“nicht befestigt” in German) part of the street the photo also shows horses and a carriage. I guess that is why that part is called the “carriageway”? In German it is called the “Fahrbahn”, which seems to be a more modern term (literally translated as “driving track”, maybe.)
