If you have an accident in one of the 2.5 million cars whose owners subscribe to General Motors' OnStar telematics system, air bag sensors and other collision detectors will trigger a wireless alert to OnStar's call center, where an employee can notify a 911 operator of your location. But in the next few years, far more data -- including information on the force and direction of impact and whether the car has rolled over -- will also be available. And this data will go not just to OnStar operators but directly to police and emergency room doctors, who can gauge the necessary emergency response and medical treatment even before the first squad car reaches the wreck.

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