Auto-Chaser Cars

I've seen cop cars come out of nowhere to join a car chase. Car chases in general put lives at risk and waste precious time. To fix this, I propose that cop cars outfitted with A.I are put in fake garages and alleys to chase criminals. A realistic dummy is put in the driver's seat to make it seem that it is a normal car. The front is shut off from the back and the front passenger seat is outfitted with a hidden long-range weapon (a gatling gun, sniper rifle or maybe a rocket launcher) for emergencies. The windshield on that side can slide ofer onto the driver's side. When a car chase starts, the robo-car calls for human backup (to arrest the guilty) and goes after the perp. The A.I can make life-saving decisions humans wouldn't dare of (sacrificing itself to stop an expensive and dangerous crash, for example.) After catching the criminal, he/she is tossed into the back half of the robo-car and taken to the station (unless this is a really bad criminal, like a gang leader). The tank is mostly in the back half, under a potent bomb. If necessary, the criminal can be quickly and informally executed, while the expensive front half of the car can be saved and reattached to a fully-functional rear and put back out. However, this is a 1/250 000 time chance, so the cars will almost always just need a small cleaning and fixing from time to time(the entire back end of the car has to be destroyed. If just the interior space in the end space suffers damage, it will look suspicious and unblamable on terrorists and gangs.)