Highway hypnosis, also known as white line fever, is an altered mental state in which a person can drive a car, truck, or other automobile great distances, responding to external events in the expected, safe, and correct manner with no recollection of having consciously done so. In this state, the driver’s conscious mind is apparently fully focused elsewhere, while seemingly still processing the information needed to drive safely. Highway hypnosis is a manifestation of the common process of automaticity.