Safety margins

You are feeling tired on a long drive. How does this affect your safety margins?

Tiredness dulls your judgement, so you should stop and rest
Correct
It has no effect as long as you stay under the limit
It only matters at night
Opening a window fully removes the risk

Why?

Rule 91 of The Highway Code says driving when tired greatly increases crash risk, as it slows reactions and weakens your judgement of speed and gaps. Take a break of at least 15 minutes after every two hours of driving.

Highway Code rule 91

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