I still think the auto trade workers make a poor choice in building forts however, as forts take much longer to build than the relevant improvement. Do they build forts over oil before combustion btw?
Shame auto workers don't prebuild forts under existing improvments, that would be a very handy feature!
@Comrade forts in BTS can do a lot of useful things, ranging from connecting resource to acting as ports for overseas trade to working as ship canals. Theres a guide here. The most rare useful job for them in my experience is oddly enough land combat.
omg, million dollar question, do you need the combustion tech literally for tanks or is it just access to oil resource and industrialism tech?

okay so I checked civilopedia and it said as requirements only: rifling, industrialism, and oil, wonder if it works though... the fort on oil thing...