Free theory test: Plates
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How the official exam works
25
questions
5
errors allowed
An example from the question set
What does this hazard identification number mean?
Hazard identification number 64 means: toxic solid, flammable or self-heating. The first digit indicates the main hazard, while subsequent digits indicate subsidiary hazards.
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Frequently asked questions
Is ADR Hazard Plates an official DSB exam?
No. ADR Hazard Plates is a practice tool for learning to read orange ADR plates — it is not an official DSB exam. The official ADR exam at DSB is the basic course exam (G-ADR), optionally combined with specializations. Use the Hazard Plates test as a supplement to the ADR basic course.
How many questions and how many errors are allowed?
The full version has 25 questions with max 5 errors — you need at least 20 of 25 correct to pass the practice test. The shorter practice test has 15 questions for quicker repetition.
What do the numbers on an orange ADR plate mean?
The upper number is the hazard ID (Kemler code) describing the type of hazard — the first digit indicates the main hazard, and doubling intensifies it (33 = highly flammable liquid). The lower number is the UN number identifying the substance itself (e.g. 1203 = petrol). An X prefix means the substance reacts dangerously with water.
Who benefits from practising hazard plates?
Drivers taking the ADR basic course, fire and rescue crews, police, factory staff and logistics workers all benefit from being able to read orange ADR plates quickly and correctly. Correct interpretation of hazard numbers is critical during dangerous goods incidents.
What does the X prefix in front of a hazard number mean?
The X prefix in front of a hazard number means the substance reacts dangerously with water. Example: X423 — flammable solid that forms flammable gas on contact with water. Water must never be used as an extinguishing agent without expert assessment.
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