As a modern domestic witch a large amount of time can be spent in your car. There are multiple spells for automobiles: everything from protecting your car from having issues in the snow to quick prayers to get a better parking spot. Protection spells for your car can be elaborate rituals invoking gods and goddesses, burning herbs and casting circles. There is, however, a very simple charm that you can create to invite a protective spirit to your car, much like inviting a domestic deity into your home.
The first step starts with a small, plastic toy. The trick is to find a toy that represents something that you find to be fierce and protective: lion, bear, dragon, dinosaur, griffon, leopard, wolf, gorilla, tiger, elephant. Track down a miniature representation of the animal and cleanse it in whatever way feels best to you. This could mean a sage smudging, leaving in a moonlit window overnight, etc..
When the animal is cleansed to your liking, hold it in your hands and fill it with your intentions. Visualize the animal in it's full grown shape, protecting your car from theft, from accidents and from negative energies. In your mind's eye, see it protecting those who regularly travel in the vehicle. When you feel that it's properly charged, find a way to connect the animal to your car, such as gluing it to the dash, or hanging it from the rear-view mirror. Just remember that the animal should have a position where it can look out over the road to see what's coming.
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