In work zones, which two colors of flashing signals are used to warn road users of obstructions or changes in road configuration?

• A. Blue, White
• B. Yellow, Orange
• C. Orange, Yellow
• D. Yellow, Orange

Answer: (C)

In work zones, drivers are warned of obstructions or changes in road configuration using orange and yellow flashing signals. Orange signals specifically designate construction or maintenance zones and point to temporary traffic control devices, workers, or equipment. Yellow signals convey caution and alert you to potential hazards or changes ahead, such as lane shifts or narrowed shoulders. Seeing both colors together signals a temporary setup where you should slow down, stay alert, and follow any posted instructions, since the traffic pattern may change quickly. The other color combinations don’t fit typical work-zone warning signals, as blue and white aren’t standard for indicating obstructions or changes in road layout.