Interesting. I like the idea of using a cop car as a defensive or offensive weapon. In H1Z1 one of the recipes are rigged lights what if you can rig the cop car to a switch thats keeps the sirens on. Set the switch RUN away than the sound leads zombies out of or to a specific area. Could also be rigged to go off near your base to lure zombies into a specifc area you have set with Pig leg traps to kill as many as you can.