What is the maximum free fall limit when using a suspension bridge?

The correct answer highlights that the maximum free fall limit when using a suspension bridge is set at 2 feet. This limit is crucial for ensuring the safety of personnel working at height. A maximum free fall distance is defined to minimize the risks of serious injury in the event of a fall.

In environments like suspension bridges, where there may be swinging or dynamic motions, maintaining a controlled free fall distance is essential. This standard helps to effectively reduce the forces exerted on the body during a fall. It is also aligned with safety regulations that often stipulate restrictions to ensure that rescue operations can be performed safely and that the risks associated with falls are adequately managed.

The other options provide distances that exceed the recommended limit, which would increase the risk of severe injury or complicate rescue operations. Thus, the choice of 2 feet reflects best practices in fall protection protocols within such engineering settings.