Correct answer
Because water can mix with road dirt and create a slippery layer.
Water can mix with dust, grease and other road residue, greatly reducing grip. Reduce speed and increase the gap according to conditions. This does not mean heavy rain or a wet road after rainfall is safe: both require care and can present greater risks depending on circumstances.
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Because the first drops always improve grip immediately.
Because water can mix with road dirt and create a slippery layer.
Because dirt prevents water from affecting the tyre.
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