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A1Difficulty 3/5

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

Correct answer

When the first drops fall after a dry period.

When rain begins. That mixture can greatly reduce grip, so moderate speed, increase separation and brake smoothly. This does not mean every onset of rain is always more dangerous than all heavy rain, or that a still-wet road is safe. Water accumulation, road and tyre condition, and speed also matter; more water can create an aquaplaning risk.

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  • Only when rain stops and the pavement is already completely dry.

  • Never; water mixed with dust and grease always improves grip.

  • When the first drops fall after a dry period.

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