History
Far into the future humanity has suffered from and adapted to the worst impacts of climate change. During the period of social, political, and economic upheaval that occurred those communities that were willing to work together, make radical changes, and become self-sustaining were able to survive and even thrive in the new landscape.
You play as someone living in that time who is driving across a large continent. On your way you will explore unique regions, fulfill earnest requests, meet interesting people, help out where you can, learn more about your world, and ultimately make your way to the destination.
PC motivation
Different motives for different vehicles/PCs?
Requests
Lots of little stories within requests, especially when transporting NPCs.
Money
Money takes the form of “cred” which can be earned by fulfilling requests from the people you meet on your journey.
Settlements and cities
Most settlements are highly communal. Small settlements will typically have a single collectivist unit while cities have lots of groups representing each block or apartment building.