Which color is typically used as the background for roadwork signs?

The color that is typically used as the background for roadwork signs is orange. This is because orange is universally recognized in traffic control to indicate construction, maintenance, and related activities. It serves as a warning for drivers to be cautious and alert for potential hazards due to roadwork. The use of orange for these signs helps to enhance visibility and attract attention, which is crucial in ensuring the safety of both the workers and the traveling public.

The other colors, while used in different contexts within the traffic sign category, do not serve the specific purpose of indicating roadwork. Red is primarily used for stop signs and prohibitive messages, yellow indicates warning signs typically related to caution in driving conditions, and green is often used for directional signs and informative guidance. Thus, orange is the correct choice for indicating roadwork signs.