Designed for two or more functions?

• A. Arch Bridges
• B. Combined Bridges
• C. Railway Bridge
• D. Keystone

Answer: (B)

In bridge design, some structures are built to serve more than one purpose, handling different types of traffic or uses on the same framework. A combined bridge is specifically built to carry two or more functions, such as road traffic on one deck and railway traffic or pedestrian paths on another, often with loading and vibration considerations that accommodate both. This multi-use requirement is what makes a combined bridge the right choice. An arch bridge describes a structural form, typically used for carrying a single type of load. A railway bridge is designed mainly for trains. A keystone is the central wedge at the top of an arch.