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In amateur and pro sportscar racing, all cars are required to have a prominent kill switch that cuts the main power from the electrical system, and this is just with 12V ignition and accessory systems.

It's always seemed like a great idea , and I expect that the only reason it isn't done in ordinary street cars is that the companies never liked reminding people of the potential of accidents (with some exception by Volvo & occasional others selling superior safety).

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