RAGE 2 is full of various side activities. Some of them can damage your vehicle quite badly. Enemies can focus their fire on your vehicle. When this happens, you will be left alone, wandering through the deserts in search of a new mode of transport. However, this will never happen in RAGE 2 - your character can call a selected vehicle.
Open the menu and select vehicles tab. There, you can choose which vehicle you want to use.
This operation will cost you $10.
The vehicle will fall from the sky and land right in front of you. Remember, you can only do that in open areas. You can't use it while you are doing one of the side activities.