Which color sign is commonly used to indicate a construction zone?

• A. Orange
• B. Blue
• C. Green
• D. Yellow

Answer: (A)

Color signaling in traffic signs communicates the type of instruction drivers should expect. For construction zones, orange is used because it stands out against typical road backgrounds and signals temporary work and changes in traffic patterns. This makes drivers slow down, watch for workers and equipment, and follow any detours or reduced-speed requirements. Other colors have different meanings: blue signs provide services or information, green signs give directions or permitted actions, and yellow signs warn generally, but are not specifically reserved for construction. So orange is the color commonly used to indicate a construction zone.