I think the related problem to cross shipment of materials is that there probably are a large number of unnecessarily trucks on the roads. My map is pretty spread out, so I don’t monitor everything continuously. After watching the rocket motor factory and copper mine issue for too long, I scanned back over to find a traffic jammed up area and in that jam was a long string of copper trucks (among strings of other types). They may not have been heading for that particular rocket factory, but they were a long ways past the industry that they were created to supply.
Often times it’s a good idea to keep similar posts in the same topic for organization