What do black-on-orange signs indicate?

Answer: B — Work zones

Black-on-orange signs are specifically used to indicate work zones. These signs are crucial for safety, alerting drivers to significant changes in the road conditions due to construction or maintenance activities. When drivers see a black-on-orange sign, they should be prepared for potential delays, reduced speed limits, or sudden stops. This color combination is designed to stand out and draw attention, ensuring that drivers are aware of the need to navigate carefully through areas where workers or heavy machinery may be present. The importance of recognizing these signs cannot be overstated, as they help in the prevention of accidents and create a safer environment for both drivers and road workers.