As summer road trips begin and rainy weather arrives, many drivers may encounter one of the most dangerous situations on the road: hydroplaning.
This happens when a layer of water builds up between a vehicle’s tires and the road surface, causing the tires to lose grip. In severe cases, drivers can temporarily lose steering and braking control.
A new study from the University of Georgia has taken a closer look at what causes hydroplaning and what drivers can do to reduce the risk. The findings were published in the journal Applied Sciences.
According to the U.S. Federal Highway Administration, wet roads and severe weather contribute to about 500,000 injuries and 6,000 deaths every year.
Researchers say that understanding hydroplaning could help improve both road design and vehicle safety.
To investigate the problem, the research team used both computer models and real-world experiments. They placed tires on a testing device that allowed them to control tire speed and the amount of water on the pavement. Sensors measured the forces acting on the tires as they moved across the wet surface.
The experiments showed that both vehicle speed and water depth influence hydroplaning risk.
At first, the risk increased as the amount of water on the road increased. Surprisingly, however, the risk began to decline once the water reached about 10 millimeters, or around 0.4 inches, deep.
Researchers believe this happens because thin layers of water may actually be harder for tires to push aside. In deeper water, the risk is highest when the tires first encounter the water. As the tires move forward and push the water away, they gradually regain more contact with the road surface.
Speed turned out to be one of the most important factors.
As a vehicle moves faster, water creates more pressure beneath the tires, making it easier for the tires to lift off the road surface. The researchers compared this effect to an airplane taking off. Once a certain speed is reached, the lifting force becomes much stronger.
Several other factors also influence hydroplaning risk. Tire tread patterns help channel water away from the tires. Tire pressure affects how much of the tire remains in contact with the road. The texture of the pavement and how well water drains from the road surface also play important roles.
The good news is that drivers can take steps to reduce their risk.
The researchers say that slowing down during rainy weather is one of the most effective ways to prevent hydroplaning. Because speed is under the driver’s control, reducing speed can greatly improve safety on wet roads.
Maintaining your vehicle is also important. Worn tires have shallower treads and are less able to move water away from the tire surface, increasing the likelihood of hydroplaning.
Road design matters too. Some highways are built with special surface layers that allow water to drain through the pavement instead of pooling on top.
Ultimately, the study highlights a simple but important message: when roads are wet, slowing down and making sure your tires are in good condition can significantly reduce the chances of losing control of your vehicle.
