On an expressway, you can avoid highway hypnosis by

Expressway driving may cause highway hypnosis, a condition of drowsiness or unawareness induced by monotony, the sounds of the wind and the tires on the pavement, and the steady hum of the engine. Try to prevent the condition by shifting your eyes from one area of the roadway to another and focusing them upon various objects near and far, left and right. Talking on a cell phone or changing lanes frequently can be dangerous.