Civil Engineering Professional Engineer Practice Exam 2025 – All-in-One Comprehensive Guide to Exam Success!

Trusses are primarily used in construction to provide structural support for various load-bearing applications such as roofs and bridges. The design of a truss allows it to efficiently distribute loads across its members, which are typically arranged in triangular configurations. This geometric arrangement enhances the strength and stability of the structure, enabling it to span long distances without significant additional material or weight.

In the context of roofing, trusses can effectively support the weight of the roof itself, along with additional loads such as snow, wind, and any mechanical systems placed upon them. For bridges, trusses are integral to sustaining the forces exerted by vehicles and pedestrians, ensuring safety and functionality.

The other options do not fully capture the primary function of trusses. While trusses can contribute to the overall structure of a building and may support walls indirectly, their main role lies in providing strategic support for roofs and bridges rather than forming walls. Similarly, while trusses can be part of decorative designs in some structures, this is not their primary purpose.