In which condition should a crane not be operated?

Operating a crane in poor visibility significantly compromises safety for both the operator and those working around the crane. When visibility is limited, the operator may not be able to accurately judge distances, recognize obstacles, or see signals from ground personnel. This increases the risk of accidents and hazards on the job site.

Conditions like severe weather and nighttime, while challenging, can often be managed with appropriate safety measures such as using additional lighting or following specific protocols for operating in those conditions. Uneven ground also poses a risk for crane stability and can typically be evaluated and mitigated with proper techniques, such as using pads or stabilizers. However, poor visibility fundamentally limits an operator's ability to operate safely and effectively, making it a clear condition under which cranes should not be used.