Highway hypnosis is a half-conscious state in which the non-thinking part of the mind is aware of the road while the thinking part is largely switched off. This is different from distracted driving where the thinking mind is still active but is engaged in a non-driving activity, such as conversing on a cell phone. Unlike the distracted driver, the person who has slipped into highway hypnosis can’t consciously shift his attention back to the road. He remains in that state until he gets into a car crash, or some disturbance.

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