During rainfall, when is the pavement typically more slippery?

The correct answer highlights a significant factor in driving safety during rainy conditions. At the start of rainfall, the pavement becomes particularly slippery because the initial rain combines with oils, dirt, and debris that have accumulated on the road surface. This mixture creates a slick layer that can lead to reduced traction for vehicles.

When rainfall starts, the water can lift these substances, making the road even more hazardous. As the rain continues, these oils and particles are washed away, leading to conditions that may be less slippery after a prolonged downpour. Therefore, while the road can still be wet and require caution, the initial moments of rain are when slipping is most likely to occur due to this combination of factors.

Understanding this helps drivers anticipate and modify their driving behavior accordingly, recognizing the increased risks at the onset of rain rather than later in the storm.