Correct answer
Because they mix with accumulated dust and grease and form a slippery film.
Because they mix with accumulated dust and grease to form a slippery film that can sharply reduce grip. This does not mean later heavy rain is safe: accumulated water also increases braking distance and can cause aquaplaning. Reduce speed, increase following distance and avoid abrupt manoeuvres; two-wheeled vehicles require particular care.
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Because they always increase tyre grip.
Because they mix with accumulated dust and grease and form a slippery film.
Because they guarantee the vehicle will stop in a shorter distance.
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