Final answer:
When oil and gasoline leak on the road surface, it creates a film that reduces friction, making the road slippery. Light rain combines with the oil and gasoline, further reducing friction. Heavy rain causes the tires to hydroplane, making it harder to brake and steer.
Step-by-step explanation:
When oil and gasoline leak onto the road surface, it creates a thin film on top of the road. This film reduces friction between the tires and the road, making the road slippery. When a light rain falls, the water mixes with the oil and gasoline, further reducing friction and making it even more difficult to control the car. In a heavy rain, there is enough water on the road to cause the tires to hydroplane, which means they are lifted slightly off the surface of the road. This makes it harder to brake and steer, significantly affecting the control of the car.