The correct option is A.
It is usually most slippery at the start of rainfall.
Roads are most slippery at the beginning of rain due to oil and dirt from traffic. By the end of the rain, the oil and dirt are more likely to have been washed off the roadway.
How does rainfall affect roads?
Heavy rain can decrease average speed by 3 to 16 percent. In heavy snow, average freeway speeds can decline by 5 to 40 percent. Low visibility can cause speed reductions of 10 to 12 percent. Free-flow speed can be reduced by 2 to 13 percent in light rain and by 6 to 17 percent in heavy rain.
What are the negative effects of heavy rainfall?
Heavy rainfall can lead to numerous hazards, for example, flooding, including risk to human life, damage to buildings and infrastructure, and loss of crops and livestock. landslides, which can threaten human life, disrupt transport and communications and cause damage to buildings and infrastructure.
Learn more about the effects of rain here https://brainly.com/question/7594464#SPJ2
