I Need Some Thoughts!

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Hi there!

So I am a game designer part time and I am currently working on a TTRPG. I've given it the nickname: Project Hermes and here is what you need to know:

The game is all about travelling, exploration, and making new friends on the road. It uses three unique mechanics on top of standard simplified d20 based systems. Those mechanics are

1. The car
   1. The car is the lifeblood of this game. It is a game all about travelling across large distances, hitchhiking, and working with what little tools you have. This means that keeping your car in good condition as well as storing all of the stuff and people that you gather along the way is absolutely essential. I won't spoil any of the mechanics until this is done (I am contracted to make games for a company so if I tell yall I can't use this one) but know that the type of person you are affects the way you drive, how the car holds up, and how much the car can store. For clarification, this is not a solo game.
2. The world
   1. This is also a map making game. At the current moment I am working on a way to take real maps and use them for this game but for now, the map develops as the game goes on. This is basically the only part of the game that is undefined. I have a good idea of what it should be but I don't think I can say much here, sorry. Just know, as I said, that the map is a thing that develops with play, it is made (sometimes) by the players, or at least edited by them, leaving you with a cool memento when the game is over. 
3. The travel
   1. Travelling in this game can be costly at times and there are a variety of systems in place to help track and manage how often things break down and how often you need to stop for supplies. If you know blades in the dark, you know what I'm using to track this. It's not re-inventing the wheel (see what I did there?) but it's smooth and consistent and, most importantly, immersive. 

There are, of course, other things. Please feel free to ask and I will tell you about everything I can, Hermes is quickly becoming a favourite of mine. It has jumped the development queue that I have and is now my full time project. 

Anyways, if you have read this far, thank you, now I need your help. I am kind of lost on setting. This game has the unique opperunity to be set anywhere at any time and, yes, that is cool but it is actually more limiting than you think. For example, if I wanted aliens, magic, radiation, or something else that comes from the world the game is set in, I need rules for that. Basically what this all means is that I need to choose a setting so I can write rules and lore for it.

Please, please, pretty please, give me your suggestions. At the moment my front runner is a non-magic post-apocalypse but I don't know if that is too bog standard/boring. I'd love to hear about some of your favourite settings and any suggestions you may have for me!