Und hier die Auflösung, gefunden unter lapdonline.org
Carjacking:
The "Bump and Rob"
It works like this. A car, usually with a driver and at least one passenger, rear-ends or "bumps" you in traffic. You quickly get out to check the damage and exchange information. Either the driver or one of the passengers jumps in your car and drives off.
If you're bumped by another car, look around before you get out.
Make sure there are other cars around, check out the car that's rear-ended you and who's in it.
If the situation makes you uneasy, memorize or jot down the car's tag number and description; signal the other car to follow you. Drive to the nearest police station or to a busy, well-lighted area.
If you do get out of the car, take your keys (and purse or wallet if you have one) with you and stay alert.
Also der gleiche Tipp wie bei Avis, ich denke, die haben beim LAPD abgeschrieben. Dann sollte man sich auch so verhalten, vorausgesetzt, es kracht nicht zu sehr.