Which railing system is described as being constructed primarily of reinforced concrete and is commonly used due to strength and impact resistance?

• A. Concrete Bridge Railing
• B. Concrete Barrier Railings
• C. Concrete Parapets
• D. Precast Concrete Railings

Answer: (B)

The key idea here is that a railing designed to stop or redirect vehicle impacts is built as a rigid, reinforced concrete barrier. Reinforced concrete combines concrete with steel reinforcement, giving it the bending strength and energy‑absorption capability needed to withstand crash loads. A concrete barrier railing is designed as substantial, continuous mass so it can absorb impact forces and redirect a problematic vehicle away from the protected area, rather than allowing it to crash through.

Concrete Barrier Railings are the typical choice when strength and impact resistance are the primary requirements, such as along highways or medians where vehicle crashes are a safety concern. While other options like bridge railings or parapets can also be concrete, they are usually geared toward different functions or loads (aesthetic, pedestrian protection, or bridge-specific edge protection) and may not be optimized for the same high-impact performance. Precast concrete railings can achieve similar materials, but the description emphasizing the solid, reinforced, impact‑resistant barrier best fits the concrete barrier railing field.