Question

The key to safe expressway driving is staying focused on driving and guard against "highway hypnosis" which is related to _______ driving.

Answer 1

That would be drowsy driving.
The "highway hypnosis" relates to driving as some described sleeping with your eyes open because as a result of your focus on the road you can enter a trance like and dreamlike state where you are dulled and drowsy. This is very dangerous and it is important to always be mindful of your surroundings and not to drive while you are tired, so be sure to take breaks during long driving sessions.