» Highways are typically most slippery:

Highways are typically most slippery:

During a heavy rainstorm in the middle of the summer.
After it has been raining for a long time.
When they are heavily congested with traffic.
When it first starts to rain after a dry spell.
Explanation

Rain can cause roads to become slippery, particularly after a dry spell. When it first starts to rain, the oil and dust on the road surface mixes with the water, causing the road to become slippery. This is why it’s important to slow down at the first sign of rain, especially after a dry spell.

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This question appears in the following DMV practice tests:
Florida DMV Practice Test 3New Mexico MVD Practice Test 12Connecticut DMV Practice Test 15North Carolina DMV Practice Test 18Delaware DMV Practice Test 19