Final answer:
The statement is false as roads are more slippery during the initial phase of rainfall due to oil and gasoline residue mixing with water, creating slick conditions until heavy or prolonged rain washes it away.
Step-by-step explanation:
This statement is FALSE. Roads are actually likely to be more slippery during the first few minutes of rainfall, especially after dry conditions. This is because oil and gasoline residue that has built up on the road surface mixes with the water, decreasing traction. Once the rainfall is heavy enough or persists for a longer period, it can wash away much of this slick combination, potentially restoring some of the road's natural grip, though roads can still remain slippery due to the water itself.