On wet road surfaces problem will arise in transmitting the power from tires to road surfaces. The co-efficient static friction depends on the driving speed, condition of the tyres and the road surface. The co-efficient of static friction falls drastically on the wet road surfaces as part of the overall friction consists of fluid friction. If the tyres begins to slide on the film of water, this is referred to as aquaplaning.
During aquaplaning neither the braking nor the steering forces can be transferred to the road surface as pure fluid friction is involved.
Source: Autobei
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