Streets and highways are most slippery:
Answers
When it has been raining hard for several hours.
When they are clean and dry.
Just after it starts to rain.
The Correct Answer and Explanation is :
The correct answer is:
Just after it starts to rain.
Explanation:
Streets and highways are most slippery just after it starts to rain because the initial rainfall mixes with oil, grease, dirt, and other residues that accumulate on road surfaces. This mixture creates a thin, slippery film that significantly reduces tire traction.
Why Does This Happen?
- Oil and Grease Accumulation: Over time, vehicles leak oil, fuel, and other lubricants onto roadways. When it’s dry, these residues build up but don’t affect driving conditions.
- First Rain Effect: As the rain begins, water lifts these substances from the surface but doesn’t wash them away completely. This creates a slick layer that makes roads hazardous.
- Inadequate Drainage: In areas where drainage systems are poor, the initial rain can cause water to pool, further contributing to slipperiness.
Timing of Danger
The first 10-30 minutes of rain are the most dangerous. If the rain continues steadily, the oil and grease are eventually diluted and washed away, improving traction over time.
Comparisons with Other Conditions
- Hard Rain: After several hours of heavy rain, the road surface generally becomes less slippery as the residues are washed away.
- Clean and Dry Roads: When roads are clean and dry, they offer the best traction, provided the tires are in good condition.
Tips for Drivers:
- Reduce Speed: Slippery conditions mean it takes longer to stop.
- Avoid Sudden Moves: Sudden braking or turning can cause skidding.
- Increase Following Distance: This gives you more time to react if a vehicle in front of you stops suddenly.
Understanding these principles can help prevent accidents and keep drivers safe during rainy conditions.