Correct answer
Monotony and few changes in the surroundings.
Monotony. An environment with few changes can reduce alertness, particularly with insufficient rest or times associated with sleep. Drowsiness can also occur in other situations: heavy traffic does not guarantee wakefulness. If sleepy, stop somewhere safe and rest.
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Heavy traffic always eliminating all drowsiness.
Any change in surroundings preventing the driver from falling asleep.
Monotony and few changes in the surroundings.
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