I would love to see roads added to the game, fist basic hardcore roads leading to concrete and finally tarmac. The roads could give a speed bonus and maintenance reduction on trucks. I dont like seeing the muddy paths and trucks and mud dont typically get on well. It would also give structure to the design of my settlement.
Bitumen could be extracted from oil cracking and used with sand/gravel to make tarmac, hardcore could be made with crushers using waste rock from mining. Id love to have to use excavators to grade the land and lay the roads. This game is brilliant.