1. Park in well-lit areas, near sidewalks or walkways. Avoid parking near dumpsters or large vans or trucks. These obstacles decrease ability to clearly see the space around your vehicle, where thieves or carjackers could be hiding.
2. Consider using the valet service if you are out shopping alone at night at a shopping center. It costs, but your car is worth more. Leave only the ignition key with no I.D. (Keep your registration and proof of insurance in your wallet).
3. If you are shopping late at night and your car is parked in the lot, ask the store clerk if it is possible for store security to escort you to your car. Most stores will happily comply with the request.
4. If you leave purchases or wrapped gifts in the car, place them in the trunk and out of view.
5. Even if burdened down with packages, try to keep one hand free with the ignition key in hand. Look around and inside the car before getting in.
6. If threatened by a carjacker with a gun or other weapon, GIVE UP THE CAR. DON'T ARGUE. A life is more important than any car.