What color(s) are roadwork/construction signs?

Roadwork and construction signs are universally recognized for their yellow and black coloring. The yellow background serves as a cautionary alert to drivers, indicating that they should be attentive and prepared for potential hazards ahead, such as construction zones or road maintenance activities. The black lettering or symbols on these signs provide clear and immediate visibility, ensuring that the information is easily legible and understood by drivers. This color combination is consistent across different states and jurisdictions, making it an accepted standard for signaling construction-related activities on roadways.