When are paved roads likely to be the slickest?

Paved roads are likely to be the slickest in the first few minutes of rain or drizzle. This occurs because, during dry periods, oil and other substances accumulate on the surface of the road. When it begins to rain, the initial drops mix with these accumulated contaminants, creating a slippery layer. This situation can be particularly hazardous as drivers may not be accustomed to the sudden changes in traction.

In contrast, while heavy rainstorms can create slick conditions, the rain often washes away some of the oil and debris, leading to improved traction as the storm continues. After a long dry spell, while the roads can indeed be more slippery, it is the immediate onset of rainfall that poses the greatest risk. During the winter season, slick conditions are commonly associated with ice and snow rather than being directly tied to the pavement’s oily residue, making this option less relevant in comparison.