What type of signs are diamond shaped with a yellow background and black lettering?

Diamond-shaped signs with a yellow background and black lettering are classified as warning signs. These signs are designed to alert drivers to potential hazards or changes in the road conditions ahead. The yellow color serves as a cautionary indicator, emphasizing the need for drivers to be aware and prepared for possible dangers, such as curves in the road, pedestrian crossings, or changes in speed limits.

The distinctive diamond shape is easily recognizable and is specifically used for warning purposes to differentiate them from other types of road signs. This helps to convey important information in a manner that is quick and easy for drivers to understand, promoting safety on the road. In contrast, regulatory signs, information signs, and construction signs each have different shapes, colors, and purposes that do not fit the description provided.