Yeah, the plans were there, but as with many things under the Weimar Republic, hyperinflation put paid to it until the NSDAP came along and threw money at it.It wasn't him though, was it?
I'll bow to your advanced knowledge in such things - and you live there - but I think the whole development of the autobahn system in Germany was already put in place under the Weimar Republic but, on coming to power, the Nazi's nicked it as their own and presented it as Hitler's idea?
I'm sure he saw the value in having a good system for moving troops, equipment and, sadly, people whilst presenting it as an opportunity for employment and leisure opportunities for the German population.
Good riddance though. Agreed.