Ding! Ding! Ding! Ding! I'm riding in the backseat of an LAPD cruiser, and it sounds like the inside of a giant slot machine. As officer Christine Labriola speeds down the side streets of LA's notorious Rampart district, a Dell laptop mounted on the Crown Victoria's dashboard chimes intermittently. A picture of each car we pass is displayed on the screen until the next car appears.

http://www.wired.com/wired/archive/14.03/lapd.html