What should be used as a barrier between oncoming traffic and responders working a roadway incident scene?

• A. Traffic cones
• B. Directional lighting
• C. Emergency vehicles
• D. Reflective barrier tape

Answer: (C)

The key idea is using a physical shield to protect responders. Emergency vehicles parked between the work zone and oncoming traffic create a tangible barrier that blocks and slows approaching vehicles, giving responders space to work safely. Their size, weight, and presence, combined with lights and sirens, signal drivers to change course or stop, effectively creating a protected work area.

Traffic cones, reflective barrier tape, and directional lighting support awareness and delineation, but they don’t provide the same level of protection as a real vehicle barrier. Cones and tape rely on drivers noticing and obeying them, which isn’t as reliable in fast-moving traffic or in low visibility. Directional lighting helps illuminate the scene and guide traffic, but it doesn’t physically impede access like emergency vehicles do.