A flyover bridge, also known as an overpass or an elevated roadway, is a type of bridge that is built over an existing road or intersection. It allows traffic to pass over or under existing roadways or other obstacles, such as waterways or railways, without having to stop or cross at the same level.
Flyover bridges are often used in urban areas where there is heavy traffic congestion or where roads intersect at different levels. They can help reduce traffic congestion by allowing vehicles to move more quickly and efficiently through an area. They can also improve safety by reducing the risk of collisions at intersections.
Flyover bridges can be built using various materials, such as concrete, steel, or composite materials. They are designed to accommodate a wide range of vehicles, from cars and trucks to buses and even trains, depending on their purpose and location.
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Types of flyover bridges
Road crossing flyover
A road crossing flyover is a clever engineering solution to efficiently handle traffic flow by directing the main traffic through a bridge at a higher level. In contrast, the low traffic is diverted to travel below. With the ramps on both sides, vehicles can easily access the flyover, allowing for a smooth and safe journey. By dividing the traffic in this manner, the chances of accidents are minimised, making it a reliable and effective means of transportation.
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Railway crossing flyover
In cases where railway crossings experience high volumes of both train and road traffic, the construction of a flyover becomes essential to keep the traffic moving efficiently and safely. By building the flyover alongside the road, it allows the main traffic to continue moving uninterrupted while trains pass by. The flyover also helps prevent traffic jams and reduces the risk of accidents at railway crossings, making it an important infrastructure investment in areas where transportation is crucial.
Flyover bridges classified according to their forms
Overpass flyover
Overpass flyovers are an important infrastructure investment, especially in areas where railways and roads intersect. When a flyover is built over an existing roadway or railway crossing, it is known as an overpass flyover. The purpose of an overpass flyover is to separate the railway path from other types of traffic, such as vehicles and pedestrians. By doing so, it ensures safe and efficient transportation for all, reduces the risk of accidents, and minimises disruptions caused by trains passing through. With its ability to separate traffic, the overpass flyover provides a vital solution for areas where traffic congestion is a persistent issue.
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Underpass flyover
An underpass flyover, also known as a grade-separated underpass, is a type of flyover that passes through an existing roadway or railway crossing below. It provides a safe and efficient means for pedestrians and vehicles to move without disturbing the flow of trains on the railway and traffic on the roadway. Both underpass and overpass flyovers are crucial for improving traffic management, reducing congestion, and ultimately decreasing the rate of accidents. With its ability to separate traffic and eliminate the need for crossings at the same level, the underpass flyover provides an essential solution for areas where traffic flow and safety are a concern.
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Flyover bridges classified according to the material used in their construction
Composite flyover
A composite flyover is a type of flyover bridge that is constructed using two or more different materials. The use of multiple materials, such as concrete, steel, and composite materials, allows for the strengths and benefits of each material to be maximised, resulting in a strong and durable structure.
Steel flyover
A steel flyover is a type of flyover bridge that is constructed primarily using steel as the main component. Steel flyovers are a popular choice due to their strength, durability, and cost-effectiveness compared to composite and concrete flyovers. However, steel flyovers are susceptible to problems related to temperature variance, which can lead to issues with expansion and compression. To prevent these problems, the steel used in the flyover construction must be galvanised or painted effectively, ensuring that it remains in optimal condition over time. Despite the additional maintenance requirements, steel flyovers remain a reliable and cost-effective infrastructure solution in many areas.
Concrete flyover
A concrete flyover is a type of flyover bridge that is constructed primarily using concrete as the main component. This type of flyover is durable and has a long lifespan, making it a popular choice for areas with heavy traffic flow. Unlike steel flyovers, concrete flyovers are less susceptible to problems related to temperature variance, providing additional stability and reliability.
Concrete flyovers also require less maintenance, making them a cost-effective solution over the long term. With its strength, durability, and low maintenance requirements, the concrete flyover is a vital infrastructure investment that provides safe and efficient transportation for communities around the world.
FAQs
What are the benefits of flyover bridges?
Flyover bridges can improve traffic flow, reduce traffic congestion, minimise accidents, and improve safety for both pedestrians and vehicles.
How are flyover bridges constructed?
Flyover bridges are constructed using a variety of construction methods, including prefabrication, post-tensioning, and steel fabrication.
What is the lifespan of a flyover bridge?
The lifespan of a flyover bridge depends on several factors, such as the material used, the quality of construction, and the level of maintenance. Generally, flyover bridges have a lifespan of 30 to 50 years or more.
How much does it cost to build a flyover bridge?
The cost of building a flyover bridge varies depending on several factors, including the size, location, and construction materials. The cost can range from a few crore rupees to hundreds of crores for large-scale projects.
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