Understanding Overbridges: Types, Benefits, and Construction Methods

An overbridge, also known as an overhead bridge or flyover, is a type of bridge that spans over another road, railroad track, or waterway, allowing traffic to pass underneath without interruption. It is essentially a bridge that crosses over another bridge or a road, rather than connecting two landmasses.

Overbridges are commonly used in urban areas where there are multiple roads or railroads crossing each other at different levels, as they help to reduce congestion and improve the flow of traffic. They can also be used to bypass traffic signals or intersections, making travel more efficient.

There are several types of overbridges, including:

1. Overhead bridges: These are the most common type of overbridge, which consist of a bridge deck that is suspended from piers or columns using cables or beams.
2. Flyovers: These are similar to overhead bridges, but they are typically used for high-speed traffic and have a more sweeping curve to allow vehicles to gain speed before crossing over the lower road.
3. Underpasses: These are the opposite of overbridges, where a road or railroad line passes underneath another road or railroad line.
4. Interchange bridges: These are used at interchanges where two highways meet, allowing traffic to cross over each other without stopping.

Overbridges can be constructed using a variety of materials and techniques, including concrete, steel, and precast components. They can also be designed with various features such as lighting, signage, and safety barriers to ensure safe and efficient travel.