What is the primary purpose of a cross brace in scaffolding?

The primary purpose of a cross brace in scaffolding is to provide stability and strength. Cross braces are installed diagonally between the vertical supports of a scaffold to create a rigid structure. This configuration helps distribute loads evenly and prevents lateral movement, reducing the risk of the scaffold swaying or collapsing under weight or wind pressure. By enhancing the overall structural integrity, cross braces ensure a safer working environment for those using or working around the scaffold.

While options like securing the scaffold to the ground and supporting additional weight have their roles in scaffolding systems, they do not capture the essential function of cross braces as effectively as providing stability and strength does. Thus, the correct answer highlights the fundamental role of cross braces in maintaining the safety and reliability of scaffolding setups.