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I think an accident causes gasoline to burn more often than explode. Even when the tank explodes I don't think it would be as dangerous as a fly wheel shattering with shrapnel flying everywhere.



Flywheels running at high speed are not made of cast iron or other things that turn in to 'shrapnel', they're made of wound filaments of carbon fibre bound with resin, usually they are designed with failure in mind. The bigger problem is dealing with the conversion of the energy in the wheel in to heat.

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If we have a flywheel falling on a movable object on the floor I imagine this movable object can attain quite high speeds.

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@jacquesm Does the heat problem confine it to providing only bursts of energy?

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I meant on destruction of a running wheel, not on normal use.

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