What could be described as a feature of interlocked gates and barriers?

Interlocked gates and barriers are specifically designed to enhance safety around machinery by preventing unauthorized access when a machine is operational. This functionality is critical in ensuring that individuals cannot enter or approach an area where potentially hazardous operations are taking place, thus reducing the risk of injuries or accidents. The purpose of these safety devices is to create a controlled environment where access is restricted, ensuring that only authorized personnel can be present when machinery is running. This feature is integral to the effectiveness of lockout/tagout procedures, which aim to protect workers during maintenance and servicing activities.

Other options do not accurately reflect the important safety roles that interlocked gates and barriers fulfill. For instance, while visual indications of safety can be beneficial, they do not provide the same level of security against unauthorized access as physical barriers do. Additionally, interlocked gates and barriers are built with durable materials to withstand daily use, and although some may require manual operation, their core safety function is to serve as an access control measure rather than a sole visual alert.