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In a hybrid vehicle like the Toyota Prius, couldn’t the electric motor be used to replace the transmission?

Question by al mond: In a hybrid vehicle like the Toyota Prius, couldn’t the electric motor be used to replace the transmission?
Couldn’t the electric motor part of the hybrid vehicle be used strictly for getting up to speed before connecting to the gasoline engine. The gas engine might then be run at a constant speed with greater gas engine efficiency. Maybe even not have a conventional transmission system at all, but use the electric motor in its place.
Bunch of fine answers for my education. Thanks Yahoo Answer-men for sharing your fine knowledge with me and others.

Best answer:

Answer by SlightlyDusty
Things could get scary with a direct drive to the wheels at 3000-6000 rpm

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