Which sign tells you to slow down because you are approaching a double curve?

The sign that signals a driver to slow down because they are approaching a double curve is indicated by a yellow diamond shape with arrows. This shape and color are specifically utilized in warning signs, which are designed to alert drivers of upcoming changes in road conditions or potential hazards. The arrows within the diamond indicate the path of the road ahead, directing attention to the presence of the double curve, which may require a reduction in speed to navigate safely.

In contrast, the other shapes convey different messages: a red triangle typically signals a yield, a green circle indicates a general guide or information about routes, and a blue square is commonly used for service-related information such as rest areas or gas stations. These shapes and their colors are standardized to ensure that drivers can quickly and easily comprehend what actions they may need to take or what conditions to expect on the road.