Add an option for all Vehicles to be damaged. You'll start on foot and work your way up to repairing a vehicle eventually.
To repair some key parts you'll need a "car repair kit", which you can only make in "Advanced workbench table" - that is you need to progress in the game in order to finally get a car.
May be rarely (extremely rarely) you can find a car in Good condition, and a key is hidden in the house, or you can use a "hotwire kit" (which is craftable only in Advanced workbench - made of pliers, screwdriver, etc).
As it stands now, it's toooo easy to hotwire any car, and then kill all the zobmies around.
There are many similar suggestions to improve vehicle/hotwires, to name a few:
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Thank you!!!