General Motors is prepping a carjack buster that gradually slows stolen cars to a halt by turning down engine power.
The technology, dubbed Stolen Vehicle Slowdown, can allow General Motors' OnStar advisors, working with law enforcement officers, to send a signal to a stolen vehicle that reduces engine power.
When police reach the car and judge it can be safely stopped without causing an obstruction, they can ask OnStar officials to switch the engine off.
The thief may be warned though a motor's radio speakers to pull over and surrender the vehicle because police are on his tail. The car's emergency lights will flash as the warning is issued.
GM will include the technology as a voluntary add-on starting with 20 of its 2009 models - about 1.7 million vehicles.