Home › CDL Practice Tests › General Knowledge Questions › Question 266
What is the body's circadian dip that many drivers notice in the early afternoon?
- A.A natural, clock-driven drop in alertness in the early to mid-afternoon, separate from meal effects
- B.A drop caused only by air conditioning
- C.A sign that the driver is ill
- D.A myth with no effect on driving
Correct answer
A. A natural, clock-driven drop in alertness in the early to mid-afternoon, separate from meal effects
Why
Human alertness follows a daily rhythm with dips overnight and again in the afternoon. Planning demanding driving and rest with that rhythm in mind lowers risk more than fighting it trip after trip.
Manual topic: Fatigue - Circadian Rhythm · From the General Knowledge practice bank (GK-266).