What is a common sign indicating that a road is slippery?

A sign depicting a car skidding is emblematic of slippery road conditions, as it directly illustrates the consequences of a vehicle losing traction on a slick surface. This type of visual warning effectively communicates to drivers the potential for loss of control, prompting them to exercise greater caution while driving under such conditions. By recognizing this sign, drivers can prepare to adjust their speed and driving behavior to reduce the risk of accidents.

In contrast, while other signs may imply hazards related to road conditions, they do not specifically convey the immediate danger associated with slippery roads. For instance, a sign showing falling rocks typically indicates geological hazards rather than slippery surfaces, whereas warnings about ice or wet roads, though related to traction issues, do not depict the dynamic consequence of a vehicle skidding.