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No, but it determines how well you can steer. Especially in sharp turns you usually have to shift down/up. If there's an obstacle (perhaps a person), both hands on the wheel will give you more room to steer in both directions. You'll be much more limited with one hand.

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You don't shift up/down in turns, but before and in the exit path out of them.

I (and many others) do. After a traffic light on a large intersection you will have to (or at least should) shift to second gear with most cars before you're clear of the intersection.

It really depends on how you one-hand: arms locked at 12 o'clock, leaning toward the center is a terrible position, but left hand at 9/right hand at 3 (for RHD cars) is perfectly fine for steering response.

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