Correct answer
Because the water mixes with the dust and grease, making the road more slippery.
The most dangerous time for a vehicle travelling on a road in the rain is when the first drops fall, because they mix with the dust and grease on the road, and this mixture makes it more slippery and gives vehicles less grip.
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Because windscreens do not start working until there is heavy rain.
Because these small drops make it harder to see through the windscreen.
Because the water mixes with the dust and grease, making the road more slippery.
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