What must be ensured about the side box door during inspection?

During a pre-trip inspection, ensuring that the side box door is securely closed is crucial for several reasons. A closed side box door prevents the loss of tools and equipment that may be stored inside, which is essential for safety and operational efficiency. An open door can lead to potential road hazards or distractions while driving, increasing the risk of accidents.

Additionally, a securely closed door protects the contents from weather elements which could damage equipment or tools. In a commercial driving context, ensuring all compartments and doors are properly secured reflects adherence to safety regulations and good operational practices.