Which of the following is a key factor in ensuring the safe operation of a dumper?

Regular maintenance and inspection of the dumper are crucial for ensuring safe operation because they help identify and rectify potential hazards before they lead to incidents. This includes checking key components such as the brakes, steering, tires, and hydraulic systems to ensure they are functioning correctly. A well-maintained dumper is less likely to fail during operation, which directly contributes to the safety of the operator and those nearby.

The other options contain practices that could compromise safety. For example, utilizing the maximum load capacity can lead to overloading, affecting stability and control. Operating at high speeds increases the risk of accidents, particularly in environments with obstacles or uneven terrain. Ignoring weather conditions can lead to unsafe operating situations like reduced traction or visibility, further increasing the risk of accidents. Regular maintenance and inspection act as a foundational practice to promote safety in dumper operations.