Suggestions! Right, mechanics can fix a car whenever they want, wherever, tires and all... that's a bit wrong. Repairs need to take more time the more extensive the damage is, replacing the tires if they're punctured could be another entirely different repair that's separate from repairing damage.
Mechanic workshops! Yeah, fun stuff. At workshops mechanics could install several modifications for someones car not just what's ingame so far.
Run-flat tire: After a tire is punctured the tire(s) are repaired for a limited amount of time or a fixed distance.
Window tint: Windows tinted to varying degrees to only allow recognition at a certain distance, legal limits should be made.
Any other ideas?