Pretty sure you can drive vehicles because the recent gameplay video shows you can either kill the driver of a truck and drive to destination, or intimidate the driver to take you there.
That being said, I'd take any x times larger claims with a grain of salt. Like they can refer to metric units or miles, but those units or miles can be represented differently in game. 4 times larger sounds cool but may really be only 1.5 times larger. If it takes say 10 minutes to walk from one side of the map to the other, 4 times larger, with the units and pace being equal, should take 40 minutes to walk. But that's never the case in "x times larger" than the previous game cases,