So you’re focused on withstanding road brain.

After WW2 everyone was broke. In Germany there was no money to build new massive freeway projects. No one had money to buy cars anyway. You can watch the movie “Judgment at Nuremberg”, it’s fiction but one thing that stuck out to me was people riding bicycles. They also had a lot of things to focus on. It took a long time to get things back on track.

Japan also had no money, though they did try the car thing for a while afaik. There were many problems. First was there was not much room for the cars and car parks. Land is tight there. Second was there was no massive domestic gasoline production. I think they finally realized that if everyone drove like Americans, that they would be sending a ton of money outside the country for oil.

As for how Japan became home to massive car companies. First the lack of resources led to the Japanese car companies making a new production technique called Just It Time manufacturing. Instead of lots of inventory of parts to assemble, they timed everything to arrive just in time. Sometimes called lean manufacturing. It may not sound like much but it leads to much cheaper production. And they committed to high quality with “Andon” which was a pull cord workers could pull to stop the line and call management over to quality or production issues. They really got the manufacturing process down because of necessity. Finally they really needed things to export, cars were one of them. Cars are high value and relatively easy to export.

The German domestic market was still big enough on its own to keep their companies aloft. I’m not sure how those expanded.