aquaplane at speeds above 45-58 mph (72–93 km/h). Motorcycles Motorcycles benefit from narrow tires with round, canoe-shaped contact patches. Narrow tires are less vulnerable to aquaplaning because vehicle weight is distributed over a smaller area, and rounded tires more easily push water aside. These advantages diminish on lighter motorcycles with naturally wide tires, like those in the supersport class. Further, wet conditions reduce the lateral force that any tire can accommodate before sliding. While a slide in a four-wheeled vehicle may be corrected, the same slide on a motorcycle will generally cause the rider to fall. Thus, despite the relative lack of aquaplaning danger in wet conditions, motorcycle riders must be even more cautious because overall traction is reduced by wet roadways. In motor vehicles Speed It's possible to approximate the speed at which total hydroplaning occurs, with the following equation. Where is the tire pressure in psi and the result is the speed in mph for when the vehicle will begin to totally hydroplane. Considering an example vehicle with a tire pressure of 35 psi, we can approximate that 61 mph is the speed when the tires would lose contact with the road's surface. However, the above equation only gives a very rough approximation. Resistance to aquaplaning is governed by several different factors, chiefly vehicle weight, tire width and tread pattern, as all affect the surface pressure exerted on the road by the tire over a given area of the contact patch - a narrow tire with a lot of weight placed upon it and an aggressive tread pattern will resist aquaplaning at far higher speeds than a wide tire on a light vehicle with minimal tread. Furthermore, the likelihood of aquaplaning drastically increases with water depth. Response What the driver experiences when a vehicle aquaplanes depends on which wheels have lost traction and the direction of travel. If the vehicle is traveling straight, it may begin to feel slightly loose. If there was a high level of road feel in normal conditions, it may suddenly diminish. Small correctional control inputs have no effect. If the drive wheels aquaplane, there may be a sudden audible rise in engine RPM and indicated speed as they begin to spin. In a broad highway turn, if the front wheels lose traction, the car will suddenly drift towards the outside of the bend. If the rear wheels lose traction, the back of the