What do black on orange signs on a highway indicate?

Black on orange signs on a highway are specifically used to convey important information to drivers navigating through work zones. These colors are chosen to ensure high visibility and to alert drivers to the presence of construction-related activity or hazards. The black text provides clear and direct messages while the orange background signals that the information pertains to work zones.

This coloring and design help capture the attention of drivers, ensuring they are aware of potential delays, changes in driving patterns, or specific instructions that could affect their travel. While warnings about construction zones (indicated commonly with yellow) and other types of safety information exist, black on orange is uniquely designated for work zone communication, making it distinct and crucial for safe navigation in such areas.