speed and shock factor, often two cars are taken, that way if one breaks down or is involded in a collision, or used to ram the old bill, the other is on hand.,

Then when a few miles away switch to another car that will be parked up and away they go!!

Chances are by the time the time the old bill arrive they will be long gone, should one be close it is only likey to be one and if rammed, they aren't going anywhere!!

been a spate of jobs around here the last few months, old bill seem powerless to convict, even when they know who it is.