What do work zone or construction zone signs usually feature?

Answer: C — Black letters on an orange background

Work zone or construction zone signs are specifically designed to alert drivers to changes in roadway conditions, increased hazards, and the presence of construction activities. The typical coloration for these signs features black letters on an orange background. This color combination is highly visible and effectively conveys urgency and caution, allowing drivers to immediately recognize the sign's significance. The use of orange is standardized in this context to signify construction or maintenance work, which helps in differentiating these hazards from other types of road signage. These visual cues are critical for maintaining safety for both drivers and construction workers, as they indicate the need for reduced speeds, increased attention, and other necessary actions in proximity to construction zones.