Why use girders instead of a slab for higher spanned bridges?

Question

Accepted Answer

Girders are used instead of slabs for higher spanned bridges due to their superior load-bearing capacity and flexibility.

Girders have a higher load-bearing capacity compared to slabs, making them suitable for longer spans.
Girders provide flexibility in design, allowing for various bridge configurations and accommodating different types of loads.
Girders can be precast or cast-in-place, offering construction efficiency and cost-effectiveness.
Examples of girder bridges include box girders, plate girders, and truss girders.
Girders can be made of steel, concrete, or composite materials, depending on the specific requirements of the bridge.