To keep the stacker in a straight direction and avoid collision with the cargoes on both sides, which method of operation is wrong?

Sticking your head out of the stacker to observe the situation in front poses significant safety risks. This action can easily lead to a lack of control while operating the stacker, increasing the likelihood of collisions with obstacles or cargo. Proper operation of a stacker requires full attention to the controls and a clear view of the area without compromising safety and stability.

In contrast, using mirrors effectively allows drivers to have a wider field of vision without putting themselves at risk. Driving with lights on enhances visibility, particularly in low-light conditions, making it easier to spot obstacles. Maintaining a safe distance from obstacles is essential for preventing accidents and ensuring there is sufficient space to maneuver safely around cargo. Each of these approaches promotes safe operating practices better than leaning out of the stacker, which is inherently unsafe.