Which safety feature should be checked before operating a forward tipping dumper?

Before operating a forward tipping dumper, it's essential to check the operational standards of all safety devices. This is crucial to ensure that all safety features are functioning correctly, which may include brakes, alarms, lights, and any other safety mechanisms designed to protect the operator and bystanders. Ensuring these devices are operational helps prevent accidents and injuries on site, as they are integral to safe equipment operation.

While the other choices may involve important aspects of equipment maintenance and usability, they do not directly relate to the immediate safety features critical for operating the dumper. For example, while visibility lights are important, their color alone does not determine safety. Similarly, the condition of the fuel tank and tire size, although they can affect performance and efficiency, do not have the same direct impact on safety as ensuring that all safety devices are operational. It is these safety devices that ensure compliance with safety regulations and ultimately support safe working conditions.