Which term describes a modular, factory-made section of concrete railing installed on a bridge?

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

Answer: (B)

This item tests recognizing the term for factory-made, modular bridge railing components. Precast concrete railings are manufactured off-site in a controlled factory environment as standard-sized modules, then transported to the bridge and installed as units. That modular, off-site production and rapid installation is the defining feature here, making precast concrete railings the most precise fit for the description.

Other terms describe different aspects or forms of railing but not the manufacturing method. A balustrade refers to a railing design that may include vertical balusters and can be cast in place or precast, so it isn’t inherently about modular production. A concrete bridge railing is a general label for any railing along a bridge, without specifying how it’s made or installed. Concrete parapets describe the barrier along the bridge edge and can be either cast in place or precast, but again don’t imply modular factory fabrication.