To everyone saying driveable vehicles won't make sense gameplay-wise: fully agree.
Immersion-wise: why don't we see anyone, even NPC's, using ground-based vehicles 200 years after nuclear devastation? Especially when we're seeing vertibird spam, power armor spam, and synth spam? Why not even those APC's lying around, surely they can drive over rough terrain? I can build a simple generator from my Workshop. Why can't I repair a pre-war engine?
And before you say it: NO; vehicles won't use gasoline, they'd use fusion cores and coolant, lots of which can be found in the Commonwealth, especially by adequately determined groups like raiders, Gunners and the Brotherhood.