Which of the following is true about a construction zone sign?

A construction zone sign is crucial for ensuring safety in areas where road work is taking place. The primary purpose of these signs is to alert drivers that they are approaching a work zone, which can often have unexpected changes such as lane shifts, reduced speed limits, or construction personnel and equipment in the area. When you see a construction zone sign, it is important to slow down and be cautious, as the conditions may change rapidly and there may be hazards that require your increased awareness.

Other options do not accurately represent the intent of construction zone signs. For instance, they do not indicate permanent road closures, nor do they suggest that speeding up is appropriate. Additionally, while there may be traffic signals in the vicinity, construction zone signs specifically focus on the presence of road work rather than signaling upcoming traffic signals. Therefore, the emphasis on slowing down and exercising caution when approaching construction zones is essential for maintaining safety for all road users.