This sign warns drivers to __________.

The correct answer highlights the warning associated with ice conditions that can occur on bridges. This is significant because bridges tend to freeze more quickly than regular road surfaces due to the airflow underneath them. The sign is a precautionary measure, alerting drivers to the potential for slippery conditions that could lead to loss of control of the vehicle.

Understanding this signage is crucial for ensuring safety, as failure to heed such warnings might result in accidents, especially in adverse weather conditions. Drivers should be particularly vigilant when approaching bridges during cold weather, allowing them to adjust their speed and driving behavior accordingly to navigate safely over these potentially hazardous areas.