Fascinating stuff really. Facism in general likes the 'big build' and resculpting landscapes and cities in their own image.
So the autobahn, a very good and far seeing modernist project started by the Republic government in the 20s but didn't get very far (for all sorts of reasons) before the nazis took over in 1933.
Hitler loved the idea of these things, but of course, the nazis plus long term construction project equals bugger all. Over a hundred thousand workers plus nearly three hundred thousand support staff and three years later...they'd completed a small stretch linking some areas together.
But the world speed record for cars was achieved on that road. And nazi propaganda made a huge deal whenever a small stretch opened, and of the huge world event of the speed record thing.
By 1942, they'd managed 3800km of road, out of a target of 20,000km. And because of the war, no one could drive anyway...
Basically, it was a bit of a nonentitny until way after the war (it took the west germans less than a year to repair the roads because there were so few) when a proper government could actually get on to building them.
It took till the 80s for the country to be connected properly (in the west anyway), so its hardly the first real example of a motorway, or a motorway network. The US and UK systems are older.
Bascially, nothing the casual person knows about autobahn history is true, except the nazis were 'involved'.