🔍 Key Concepts
• Definition of closed freight container in cargo handling and dangerous goods regulations
• Difference between rigid/permanent structures and fabric/tarpaulin closures
• What makes a unit effectively "closed" for containing cargo, weather, and vapors
💭 Think About
• Ask yourself: for a container to be considered truly closed, what must be true about all of its sides, roof, and ends?
• Which options clearly use rigid, permanent boundaries all the way around the cargo space, without relying on fabric or removable coverings?
• Which descriptions could allow vapors, weather, or cargo to escape more easily, and which one would best prevent that?
✅ Before You Answer
• Identify which options involve rigid, permanent structures on all sides and top versus those that use plastic/fabric or cables
• Check which options would be accepted as a "closed" unit under most dangerous goods/IMDG style definitions (think containment of leakage and weather protection)
• Eliminate any choice where the top or sides are fabric, plastic, or only secured by cables, since these are typically treated as open or soft-sided units, not fully closed ones