What signage indicates a highway work zone?

Highway work zones are specifically indicated by signs that use a black on orange color scheme. This choice is significant because orange is universally recognized as a color associated with construction and maintenance activities, signaling both drivers and pedestrians to exercise caution. The black lettering on the orange background provides high visibility, ensuring that the information conveyed is clear and stands out against the orange, which is especially important in environments where safety is critical.

Other color schemes, such as white signs with black lettering or green signs with white lettering, serve different purposes. White signs typically convey regulatory information, while green signs provide directional guidance. Yellow signs are used to alert drivers to general hazards but do not specifically indicate work zones. Therefore, the black on orange signs are uniquely suited for warning drivers of construction areas, helping to enhance safety and reduce the risk of accidents.