Final answer:
Hydroplaning typically starts at speeds as low as 35 mph, with increased risks as speeds go higher.
Step-by-step explanation:
Hydroplaning is a phenomenon that typically occurs when a vehicle travels on a wet surface at high speeds, causing the tires to lose contact with the road and slide on a thin layer of water. While the specific speed at which hydroplaning can occur varies depending on a number of factors such as tire condition, tread depth, and water depth, it is generally understood that hydroplaning can begin at speeds as low as 35 miles per hour (mph). However, as a vehicle's speed increases above this threshold, the risk of hydroplaning dramatically increases.