Final answer:
Heavy rain can cause poor visibility, mist and fog, require hard braking, and lead to hydroplaning due to the mixture of water, oil, and gasoline on the road surface which increases the risk of losing vehicle control.
Step-by-step explanation:
Heavy rains can result in several dangerous driving conditions, including: poor visibility, the potential for mist and fog, the necessity for hard braking, and hydroplaning. Hydroplaning occurs when a vehicle's tires encounter more water than they can scatter, causing the tire to lose contact with the road and the driver to lose control. Light rains mix with oil and gasoline leaked onto the road surface, creating slick conditions that can reduce a car's traction, further impeding control. Heavy rain can exacerbate this issue by causing larger amounts of standing water on the road, leading to increased chances of hydroplaning.