Explanation: If you drive at speed in very wet conditions, your steering may suddenly feel lighter than usual. This means that the tyres have lifted off the surface of the road and are skating on the surface of the water. This is known as aquaplaning. Reduce speed by easing off the accelerator, but don't brake until your steering feels normal again.
Category: Band 2 traffic signs and signals
References: The official DVSA guide to driving: section 12, Highway code: rule 227