Final answer:
Highway hypnosis is a state of drowsiness or inattentiveness that can occur while driving long distances. It is characterized by a lack of awareness and automatic behavior.
Step-by-step explanation:
Highway hypnosis is a state of drowsiness or inattentiveness that can occur while driving long distances. It is characterized by a lack of awareness and automatic behavior, where the driver may not remember parts of the journey or paying attention to the road. This can be dangerous as it increases the risk of accidents.