Concrete bridges are structures made primarily from concrete, a strong and durable material. They are designed to span physical obstacles like rivers or roads, allowing vehicles and pedestrians to cross safely. Concrete bridges can be built in various styles, including beam, arch, and cantilever designs, each serving different engineering needs. These bridges are favored for their longevity and low maintenance requirements. Reinforced concrete, which includes steel bars for added strength, is commonly used to enhance their load-bearing capacity. Concrete bridges are essential components of modern infrastructure, supporting transportation networks worldwide.