The road surface becomes very slippery when rain first starts to fall because:
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It rains harder during that time.
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Water tends to pool more at that time.
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Rain mixes with oils, dust and road film that cover the road's surface.
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Your tires absorb more water at first.
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Explanation
When rain starts to fall, the road surface can become very slippery due to a combination of factors. Oils, dust, and road film that have accumulated on the road's surface mix with the rainwater, creating a slippery layer. This is especially pronounced during the first half hour of rainfall because the water doesn't immediately wash away the dust and road film. The mixture of oil, dirt, rubber dust, and water creates a slick surface that reduces tire traction and makes it harder to maintain control of the vehicle.
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This question appears in the following DMV practice tests:
North Dakota DMV Practice Test 2California DMV Practice Test 5Arkansas DMV Practice Test 5Michigan DMV Practice Test 8New Jersey DMV Practice Test 10North Carolina DMV Practice Test 10New Mexico MVD Practice Test 11Virginia DMV Practice Test 11West Virginia DMV Practice Test 11Indiana BMV Practice Test 13