Which color is commonly associated with construction signs?

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

Answer: (D)

Construction signs use colors that grab attention and signal temporary road conditions. The bright orange color is specifically reserved for construction and maintenance work zones, so it clearly tells drivers to expect changes, workers nearby, and equipment on or near the roadway. This makes orange the most effective cue for warning about ongoing construction. Blue signs usually indicate information or services, yellow is used for general caution about hazards (not necessarily a work zone), and purple isn’t a standard color for traffic control and wouldn’t reliably indicate construction. So orange best fits the purpose of signaling construction zones.