[Q]

I noticed exactely the same and my attemps to improve that by modifying the construction.vehicle.txt files were also a failure. But the latter may be due to my insufficient knowledge. I think this is one of the most important weaknesses of the AI in the later game and I mailed it to MM with the hope they fix it sometimes. I have the suspicion it might be in some way connected to the AI state, but again nobody seems to know how this state is determined and could be checked, so it is very hard to verify.