What hazards arise from operating a crane on uneven or sloped ground?

• A. Increased tipping risk, instability, and uneven load distribution; mitigate with level pads/cribbing and avoid if necessary.
• B. Slower crane speed and higher fuel consumption.
• C. Improved load control due to gravity.
• D. Requires more crew; no safety impact.

Answer: (A)

Operating a crane on uneven or sloped ground creates a serious stability hazard because the base surface and outrigger contact points may not provide a level, solid foundation. That shift in ground level changes how the crane’s weight, the counterweight, and the load interact with the ground. On a slope, even a small tilt can move the crane’s center of gravity toward the downhill side, increasing tipping moments as the load is lifted. Outriggers may not sit evenly, pads can sink or slip, and load distribution becomes uneven, all of which can lead to sudden tilt or ground failure.

To manage this, creating a level, firm bearing surface is essential. Level pads or cribbing distribute the crane’s load over a larger area and help restore a true plane for stable setup. If a level, stable base cannot be achieved, operation should be avoided until the ground can be leveled or the crane moved to a suitable location. This is why the option describing increased tipping risk, instability, and uneven load distribution—and the use of level pads/cribbing to mitigate it—is the best answer.

The other ideas don’t address the real safety issue: the stability of the crane on soft or angled ground. Changes in speed or fuel use, gravity aiding load control, or simply needing more crew do not capture the direct risk to stability and tipping that uneven ground creates.