I have been told that when travelling on black ice
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reducing the pressure of re tyres provides a better grip. Is this vrect?
k On a wet road, the effective coefficient
of friction between the tyre and the road
partly a function of increasing the unit .essure between the tyre and the road surface ( reducing the contact area so that the tread :gments break through the film of liquid. len adequate passages in the tread enable le water to be dispelled from the area at rfficient rate which, in practice, depends on
speed of the vehicle. However, in the case a dry icy surface, there is no fluid film and ducing the contact area has no beneficial fect. Increasing the contact area by subantially reducing the tyre pressure may give marginal friction increase on an ice-covered lad so long as there is no moisture on the irface. But it is not to be recommended practice because of its effect on vehicle andling under more normal conditions and ie possibility of damage to tyre walls.