NickyH
Bismarck with lipstick…
Well, the AI handles it's workers via the same routines that are used when you automate yours.
I suspected that.
I included the mini map in the left bottom corner because it shows that china has one town in the western part of the continent, while the Chinese main territory is in the east. I believe these strange worker improvements happen when their territory is divided by yours. He just had to build a road there, so that he could be certain that there's a road network between his cities.
