Which of the following is a safety precaution when operating a stacker?

Keeping arms and legs inside the vehicle is crucial for safety when operating a stacker. This precaution helps to prevent serious injuries or accidents that could occur if a driver were to extend limbs outside the confines of the vehicle. By maintaining all body parts within the vehicle, the operator reduces the risk of catching a limb on moving parts, obstacles, or other nearby equipment, thus ensuring a safer working environment.

In contrast, driving at maximum speed significantly increases the risk of accidents and loss of control. Having others around to observe may not necessarily guarantee safety without proper communication and training. Ignoring warning signs, even if familiar with the equipment, can lead to dangerous situations that could otherwise be avoided. All of these emphasize the importance of adhering to safety protocols, highlighting keeping limbs inside the vehicle as the most effective immediate precaution.