You will need Safe Travel Oil, Safe Travel Incense, a Comfrey root, a bit of dried Fern, and a bit of dried Mint.
Light the incense in a hanging censer or thurible or in a brazier or pan with a handle so that you can carry it. Walk around the car, censing or smoking the vehicle with the incense -- and at each of the four corners, stop to liberally anoint the car with the oil. As you dress the four corners, speak aloud your petition for safe travel. Open the car doors and smoke the inside. Open the hood and dress the motor with the oil. Dress the root and place it with the herbs in the same packet in which you keep the car's essential papers (registration, proof of insurance, etc.) and dress the packet with the oil, then smoke it with the incense and put it away.
If you wish to work with any of the religious figures mentioned above, you may place a flat card or print in with the car's papers, or hang something from the rear view mirror, or affix statuary to the dashboard, or clip a metal medal to the visor. Whichever of these you choose to use, smoke