What does this sign mean?

Explanation: It will take up to ten times longer to stop when it's icy. Where there's a risk of icy conditions, you need to be aware of this and take extra care. If you think the road may be icy, don't brake or steer harshly, as your tyres could lose their grip on the road.

Category: Road and traffic signs

References: The Official DVSA Guide to Driving: Section 6, Highway Code: Page 109, Know Your Traffic Signs: Page 13