Multi-beams typically span how many feet?

Answer: C — 30 to 50 feet

Multi-beam bridge systems are designed to cover spans that generally range between 30 to 50 feet. This span length is ideal for providing the necessary structural support while optimizing material usage and construction costs. Multi-beams offer a balance between strength and efficiency, making them a preferred choice for medium-span applications. In practice, spans shorter than this can use simpler structural forms, while spans longer than this typically require more complex engineering solutions, such as trusses or arches. Therefore, the specified span range of 30 to 50 feet reflects both the engineering capabilities and the typical applications of multi-beam structures in bridge design.