Please enlarge german autobahn in size, to be better recognised for visual navigation.
Little research results:
Pre 1990 german motorways usual dimensions were between 3,5m-3,75m per lane plus aditional 0,5 meters either side next to it. The Space in between opposing direction lanes was three to four meters in width. Motorways pre 1990 usually had an extra stop lane for broken down vehicles which added another 2meters minimum each side in width.