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A hubcap or sun visor can be substituted for a shovel.
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Seat covers can be used as a blanket.
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Floor mats can be used to shut out the wind.
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Engine oil burned in a hubcap creates a smoke signal visible for miles.
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A car horn can be heard as far as a mile downwind. Three long blasts, ten seconds apart, every 30 minutes, is a standard distress signal.
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A rear-view mirror can be removed and used as a signaling device.
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Burn a tire for a signal or for warmth. Release the air pressure and use gasoline or oil for a means to ignite it.