Large electronic flashing arrow panels may be used in work zones day and night to:

• A. To measure speed
• B. To warn of road conditions
• C. To provide weather alerts
• D. To guide drivers into certain traffic lanes

Answer: (D)

Large electronic flashing arrow panels, or arrow boards, are used in work zones to control and direct how traffic moves. They display a directional arrow that shows which lane is open or closed and guide drivers into the correct lanes, especially when lanes are narrowed, merged, or blocked by construction. This helps create a safer, more orderly flow for drivers both day and night, since the bright arrows stay visible in daylight or darkness. They aren’t primarily used to measure speed, provide weather alerts, or solely warn of road conditions—their main purpose is guiding vehicles into the proper lanes to keep traffic moving safely.