Roads become very slippery:
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 starts to rain, the initial few minutes (approximately the first 10 to 15 minutes) can make roads especially slippery, and here’s why:
- Oil and Debris on the Road:
Roads accumulate oil, grease, and other substances from vehicles over time. These substances create a thin layer on the road surface. When rain begins, it mixes with these oils and substances, forming a slick layer that can make driving dangerous. This layer is especially prominent in the first moments of a rainstorm when the rain is still just beginning to wash away the dirt and oils. As a result, the roads are more slippery, and vehicles are more likely to skid. - Reduced Traction:
During the early moments of rain, the water has not had enough time to wash away the oil and grime. The tire tread cannot grip the wet surface as effectively, leading to a loss of traction. Drivers who are not accustomed to wet roads may struggle with braking, turning, or accelerating. - Road Surface Type:
The slipperiness also depends on the type of road surface. Asphalt, for example, becomes slick when wet due to its smooth texture. In the early stages of rain, the surface can remain slick until enough water is present to dilute the oils and debris. - Worsening Conditions as Rain Continues:
After the initial period, as rain continues, the road surface becomes cleaner, and the slipperiness decreases. The oils and debris are gradually washed away, improving traction.
Therefore, the first 10 to 15 minutes of rainfall are the most dangerous for drivers due to the combination of oils, debris, and the reduced ability of tires to grip the surface.