Correct answer
dangerous for road safety.
Changing usual sleeping hours can disturb rest and promote drowsiness while driving. Drowsiness can reduce attention, increase reaction time and cause microsleeps. Frequently changing schedules does not remove that risk. Aim for sufficient regular rest; if sleepy, stop in a safe permitted place and resume only when fit.
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dangerous for safety at the wheel, except for people who frequently change their schedule.
beneficial for road safety.
dangerous for road safety.
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