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BDifficulty 2/5

After a dry period, when can water mix with dust and grease accumulated on the road and form a particularly slippery film?

Correct answer

When the first drops fall

When the first drops fall. This mixture can substantially reduce grip at the onset of rain. It does not mean heavy or persistent rain is safe: accumulated water can cause aquaplaning and visibility may deteriorate. Adapt speed and following distance, and manoeuvre smoothly throughout the rainfall.

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  • After it has rained heavily

  • When the first drops fall

  • When it has been raining continuously

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