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How to emergency stop car from passenger seat?

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If the driver of a Tesla has a heart attack on the freeway what can a passenger do to stop the car as quickly as possible? Assume regen braking is set to max. Ideas?

If the driver automation is enabled, you really don't have to do much except make sure there is nothing holding the steering wheel. In a few seconds the car will start complaining that no one is holding the wheel, then goes into an alarm state and then decides to calmly and smartly stop the car.

If driver automation is not enabled, push foot off the accelerator while maintaining control of the steering wheel. Car slows relatively quickly, possibly too quickly to avoid being hit by car behind you.