A construction zone is indicated by

• A. White signs
• B. Blue signs
• C. Red signs
• D. Orange signs

Answer: (D)

Construction zones use orange signs because orange is the standard color for temporary traffic control and construction warnings. This bright color is chosen specifically to stand out from the regular green guide signs and white regulatory signs, signaling drivers to expect workers, equipment, lane shifts, or altered traffic patterns ahead. When you see orange signs, slow down, be prepared for changing conditions, and follow any flaggers or posted speed reductions. White signs typically convey regulatory or informational rules, blue signs indicate services, and red signs signal stop or prohibitions, so they’re not used to mark construction zones.