Which term describes pre manufactured concrete railing sections that are installed on bridges?

• A. Concrete Balustrade
• B. Precast concrete railings
• C. Concrete Bridge Railing
• D. Concrete Parapets

Answer: (B)

The main idea here is identifying the term that specifically describes railing sections manufactured off-site and then installed on a bridge. Precast concrete railings are produced in a factory as modular units and transported to the site to be placed along the bridge edge, often with connections like bolts or dowels to anchor them in place. This description matches the idea of pre manufactured sections precisely, making it the best label for these bridge barriers.

Why this term fits best: it communicates both the method (precast/off-site manufacture) and the function (railings for a bridge). The other terms describe related barrier elements but aren’t as precise about the production method. A balustrade refers to a particular style with balusters and isn’t inherently tied to prefabrication. A generic “concrete bridge railing” covers any railing on a bridge, including cast-in-place or precast, so it doesn’t specify the premanufactured aspect. Parapets are the wall-like barrier along the edge, which can be either precast or cast in place and aren’t restricted to the modular railing sections described here.