When is grip at its worst if begins to rain heavily after a heat wave?

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When is grip at its worst if begins to rain heavily after a heat wave?

When it rains after a heat wave, a slippery layer can be formed consisting of dust, exhaust emissions, oil residues and tyre deposits. Paving stones can become extremely slippery because of this. Grip is at its worst when it first begins to rain, as the slippery layer is eventually thinned out and rinsed off by continued rain.

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