Final answer:
The student must maintain a safe distance from a bridge, tunnel, or building when carrying Division 1.2 or 1.3 materials, often at least 300 feet, though specific distances can vary based on regulations.
Step-by-step explanation:
The question pertains to the safe distance that must be maintained from a bridge, tunnel, or building when carrying Division 1.2 or 1.3 materials, which are explosive materials. Specific regulations can depend on various factors including the quantity of explosives and the local laws or guidelines that apply to the transport of hazardous materials.
However, a commonly referenced safe distance is staying at least 300 feet away from such structures. It is important for safety and legal compliance to adhere to the correct distances as specified by transportation regulations for hazardous materials.