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QuestionEngineering

"When are streets and highways most slippery? A. When they are clean and dry. B. When it has been raining hard for several hours. C. Just after it starts to rain."
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Answer

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Step 1:
: Understand the question and identify the factors affecting road conditions.

The question asks about the slipperiness of streets and highways. Slippery roads can be caused by various factors, such as moisture, oil, and debris. We need to consider how these factors change depending on weather conditions.

Step 2:
: Analyze each option and discuss the factors affecting road conditions.

A. When they are clean and dry. - This statement is not accurate. While clean and dry roads provide the best traction, they can still become slippery due to external factors. For example, oil residue on the road surface can cause slipperiness even on dry pavement. B. When it has been raining hard for several hours. - This statement is partially correct. After a heavy rain, water mixes with oil and debris on the road surface, creating a slippery layer. However, after some time, the rain helps wash away this layer, improving road conditions. C. Just after it starts to rain. - This statement is most accurate. When it first starts to rain, the water mixes with oil and debris on the road surface, creating a slippery layer. Additionally, rain can cause tire rubber to degrade, further reducing traction.

Final Answer

Based on the factors affecting road conditions, option C is the most accurate answer. Just after it starts to rain, roads can become the slipperiest due to the combination of water, oil, and debris on the road surface.