Samenvatting
If the road surface is wet a vehicle does not always immediately react to the driver's actions such as braking and steering, because there is a film of water between tyre and road surface. If this water cannot be expelled fast enough, the direct contact between tyre and surface is lost with the consequence that the vehicle is gliding over a film of water. Hydroplaning is caused by several factors, such as speed of the car, roughness of the road surface, thickness of the water film and the tyres. In this article only the consequences of braking are discussed. Finally the author gives a survey of measures to be taken to prevent hydroplaning.