Which of the following is an indicator of a crane being in safe working condition?

A crane being in safe working condition is primarily determined by its operational integrity and safety features. Functional controls ensure that the crane responds as intended to operator commands, which is critical for safe operation. Intact safety devices, such as limit switches, emergency stop buttons, and alarms, are essential in preventing accidents and ensuring the crane operates within its designed safety parameters.

The presence of additional attachment weight could negatively affect the crane's balance and load capacity, potentially leading to unsafe operating conditions. High-speed operation capabilities might indicate a crane that can operate quickly, but quickness does not correlate with safety; in fact, it can compromise safety if not properly controlled. Cosmetic modifications may enhance the appearance of the crane but do nothing to ensure its structural integrity or operational safety, and could even hide potential issues.

Thus, the safety and functionality of controls, along with the integrity of safety devices, are the foremost indicators of a crane's safe working condition.