What measurement is crucial for safety in crane operations and determines the effectiveness of the setup?

The percentage of slope is a crucial measurement for safety in crane operations because it directly impacts the stability and balance of the crane during operation. A crane that is set up on an inclined surface must be evaluated for its ability to maintain stability under load, as an improper slope can significantly increase the risk of tipping or losing control of the load.

If the slope exceeds recommended limits, it can affect the crane's center of gravity, making it more prone to accidents. Therefore, assessing the percentage of slope ensures that the crane is positioned appropriately, mitigating potential hazards associated with uneven terrain. This measurement helps in verifying that the setup adheres to safe operational standards, contributing to the overall effectiveness and safety of crane operations.

In contrast, while radius indication, weight capacity, and angle of the boom are important factors in crane operations, they do not address the foundational aspect of how the ground itself affects crane stability as directly as the percentage of slope does.