How you sit does affect how you drive. In order to be able to steer away in case of emergency, one should have some room for his arms to move.
Unfortunately, many drivers do not realize this. Some drivers sit too far or too "relaxed", so they can hardly reach for the lower part of a steering wheel. Most drivers “hang” on a steering wheel. From those positions there is no way they can react to emergency by steering away – they just can't turn steering wheel back and forth fast enough. That leaves them with the single option: brake as hard as you can. Sometimes this is just not enough. More on proper sitting posture and discussion
