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According to road safety reports from various RCAs, about 30%-40% of road crashes occurred in wet conditions and among these wet road crashes, at least 50% of the drivers experienced loss-of-control of the vehicle in a partial or full degree, an indication of hydroplaning, which often resulted in serious injury or even fatal accidents. Unfortunately, risk of hydroplaning is often only considered in the design stage of roads and highways by providing sufficient drainage and proper selection of surface materials. During the operation and maintenance of roads and highways, there is still no direct and practical method to quantify hydroplaning risk for existing roads and highways.
Although several vehicle, roadway, and environmental factors affect the probability of hydroplaning, a general rule of thumb for highways is that hydroplaning can be expected for speeds above 70kph where water ponds to a depth of 2.5mm or greater over a distance of 10m or greater. In other words, for any set of driver inputs, tyre conditions and surfacing material, hydroplaning is only a function of water depth and vehicle speed. In this paper, a methodology for identifying and screening of hydroplaning risk area through analyzing the pavement transverse and longitudinal profile measurement from HSD survey will be introduced. Examples will be given to demonstrate that it will be a useful tool for road controlling agencies to evaluate the risk of hydroplaning for their road networks and to plan and carry out necessary maintenance actions to provide a safer road network for the public.