What is the primary characteristic of lightweight truss systems?

The primary characteristic of lightweight truss systems is reduced material usage. These systems are designed to be structural frameworks that maintain strength while using less material compared to traditional methods. This characteristic helps to make lightweight truss systems both efficient in terms of material cost and easier to handle during construction and installation.

By minimizing the amount of material needed, lightweight truss systems can also contribute to lighter overall structures, which can be advantageous in various construction applications. The design and methodology leading to reduced material usage allow these trusses to still perform adequately under load, making them a popular choice in modern construction.

The other options, while they may relate to some benefits of lightweight truss systems, do not capture the defining attribute as precisely as reduced material usage does. Nonetheless, the emphasis on reduced material helps highlight the innovative engineering and design approaches taken in creating these systems.