Where was the Road Movie trilogy filmed?

The Road Movie trilogy has 3 titles (1974 to 1976). Wikidata records no filming place for them; Wikipedia names New York City, Amsterdam, Hamburg, Bonn, Duisburg and 10 more places. Every place links to its source.

The productions, in order

Named in Wikipedia's own articles

Places named only in the titles’ Wikipedia articles.

9 of 15