Roads become very slippery:
Answers
When it has been raining for an hour or more.
The day after it rains.
For the first 10 to 15 minutes of a rainstorm.
Right after the rain has stopped.
The Correct Answer and Explanation is :
The correct answer is: For the first 10 to 15 minutes of a rainstorm.
Explanation:
When it begins to rain, roads are often at their most slippery during the first 10 to 15 minutes. This is due to a combination of factors, including the nature of the roadway, the oils and debris accumulated on the surface, and the way rain interacts with these elements.
- Accumulation of Oils and Debris: Roads, especially those that are frequently traveled, accumulate oils, grease, and other substances from vehicles, as well as dust and dirt. These substances create a slick surface when it begins to rain. When the rain first starts, it mixes with the oil and debris on the surface, creating a thin, slippery layer. This is particularly dangerous because the rainwater hasn’t had enough time to wash these substances away.
- Low Friction: During the initial rainfall, the water combines with the oils and debris on the road, reducing the friction between the tires and the road. The first moments of rainfall often have a higher risk of accidents because drivers may not anticipate the slick conditions.
- Gradual Improvement: After the first 10 to 15 minutes, the rain begins to wash away much of the debris and oil from the surface, which reduces the slipperiness. As a result, the road conditions improve slightly, although they can still be wet and slippery, especially if there is standing water or puddles.
- Impact on Driving: Drivers should exercise extra caution during the first part of a rainstorm by reducing speed, increasing following distance, and being aware of the increased potential for hydroplaning.
In summary, roads are most slippery at the start of a rainstorm due to the combination of rainwater mixing with accumulated oils and debris, leading to a temporary but dangerous reduction in traction.