Since I don't foresee the details becoming relevant in the strips anytime soon, what she was about to say was that her car has an advanced auto-pilot system. It reads her heartrate and can tell when she's asleep, at which point it kicks in, flips on the hazard lights, and gently guides it to park safely on the roadside. The only reason they still got into a crash, and this is a spoiler for the next strip, the other car's driver was already dead and his car ran a stop sign to t-bone them.
Little fun detail: Meat Head is the only one not wearing his seatbelt.
Little fun detail: Meat Head is the only one not wearing his seatbelt.