What color is used on a road closed sign?

The color used on a road closed sign is orange on black. This color scheme is specifically designed for construction and maintenance work zones to provide high visibility and alert drivers to the presence of hazards and changes in traffic patterns. Orange is universally recognized as a caution color, particularly related to highway and roadwork scenarios, while black helps the warning message stand out clearly against the orange background.

In highway work zone environments, safety is paramount, and the use of orange on black effectively communicates to motorists that they should be attentive and prepared for lane changes, detours, or interruptions in regular traffic flow. This choice is in accordance with traffic control guidelines to ensure that signs are easily seen and understood, thereby promoting safety for both road workers and drivers.