Radioactive II vs III label difference hazard endorsement quiz differences checks offline…
Radioactive II and III labels are both yellow, but they differ by category. RADIOACTIVE II shows two red vertical bars and a moderate radiation level, while RADIOACTIVE III shows three red bars and the highest level of the three, with a higher transport index. Category I is white with one red bar.
Read the bars, not just the color
Both II and III labels are yellow, so color alone will not split them. The number of red vertical bars on the label is the tell: two bars for category II, three bars for category III. The bars climb with the radiation level the package gives off.
The three categories at a glance
From lowest to highest:
| Category | Background | Red bars | Radiation level |
|---|---|---|---|
| Radioactive I | White | One | Lowest |
| Radioactive II | Yellow | Two | Moderate |
| Radioactive III | Yellow | Three | Highest of the three |
Higher category means more measurable radiation and a higher transport index. Always follow official requirements.
Placard vs label
The vehicle placard is the yellow-over-white RADIOACTIVE diamond with the trefoil and a 7. The I, II, and III categories live on the package labels, shown by the bars and the transport index, not as the class number. Radioactive transport is tightly regulated, so verify the details in your official materials.
Frequently asked questions
- What is the difference between Radioactive II and III?
- Both labels are yellow, but II shows two red vertical bars (moderate level) and III shows three bars (the highest of the three, with a higher transport index). Confirm in your official materials.
- How do you tell the radioactive categories apart?
- By the red vertical bars: one for I (white), two for II (yellow), three for III (yellow). The bars rise with the radiation level.
- Which radioactive label is the most dangerous?
- Category III indicates the highest measured radiation of the three and the strictest handling. Always follow the official requirements.