HazoraRead the code as a code
ADR section 5.3.2.3 explains the hazard identification system and lists the meanings of particular numbers. Repeated digits can intensify a hazard, while some combinations have a specific listed meaning. An X prefix indicates a dangerous reaction with water. Do not build a complete interpretation by casually translating each digit in isolation.
| Panel element | Question it addresses |
|---|---|
| Upper hazard number | What hazard identification category is indicated? |
| Lower UN number | Which substance or entry is identified? |
| Placard | Which hazard class or subsidiary hazard is shown? |
Use the official entry for anything beyond practice
Compare an educational example with the full ADR entry, including its qualifiers. A result outside this tool's small supported set must remain unrecognized here; it must not be guessed from the nearest-looking code. The source link gives access to the official ADR 2025 volumes.
Hazora's iPhone app combines ADR-number lookup with the separate ERG 2024 material and guide references. Neither the short decoder nor an upper panel number supplies all the information needed for an emergency decision. In a real incident, use trained responders, the applicable official references and local procedures.