Which traffic sign features an orange background with black letters?

The sign featuring an orange background with black letters is used specifically for construction purposes. This color scheme is intentional to alert drivers to temporary dangers or changes in the roadway due to construction activities. The bright orange color is highly visible and is universally recognized in many places as a warning of an active work zone, thus ensuring that drivers remain cautious and aware.

While warning signs also serve to inform drivers about potential hazards, they typically use yellow backgrounds. Guide signs, which help with navigation and directions, usually utilize green or blue backgrounds. Regulatory signs are defined by their use of white backgrounds with black or red lettering to communicate laws and regulations that must be followed. Therefore, the distinctive use of orange signifies the construction-related nature of the sign in question.