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you only need clutches when you're stopped - to engage an moving/idling motor to stationary drive wheels.

Electric cars don't need clutches because their motors stop too

Probably the car will switch between gears while in motion. It seems to me that it would be difficult to do that smoothly without a clutch.

It is only important to carefully match the revs when switchen gears. Electric cars with electronic control can be easily programmed to do so.

Put an encoder on both shafts, have a control loop match the speeds, adjusting as frequently as desired, easy.

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