ADR UN Number Lookup
Search the complete ADR Table A dangerous goods list. Type a UN number or substance name and get the full record, from danger labels to tunnel restriction codes.
ADR and UN numbers: frequently asked questions
What does ADR stand for?
ADR stands for "Accord relatif au transport international des marchandises Dangereuses par Route": the Agreement concerning the International Carriage of Dangerous Goods by Road. It was signed in Geneva on 30 September 1957 under the UN Economic Commission for Europe and entered into force in 1968. Its annexes are revised every two years; the current edition is ADR 2025. Table A in chapter 3.2 lists every dangerous substance with its transport requirements.
What is an ADR certificate?
An ADR certificate is the driver training certificate for dangerous goods: it proves that a driver completed an approved ADR course and passed the exam. Drivers who carry dangerous goods above the ADR exemption limits need one. It is valid for five years and is extended by five years when the driver passes a refresher course and exam in the year before it expires.
What is a UN number?
A UN number is a four-digit number assigned by the United Nations that identifies a dangerous substance or article, such as UN 1203 for petrol. It appears in the transport document and, on tank and bulk transports, on the orange plate.
What do the ADR tunnel restriction codes mean?
Tunnels are classed from A (no restrictions) to E (almost all dangerous goods prohibited). A substance's tunnel code says from which tunnel category it is banned: code B means the load may not pass through tunnels of category B, C, D or E, while code E only bars category E tunnels. A combined code such as C/D gives one restriction for tank transport and one for other transport. An entry without a code has no tunnel restriction.
What do packing groups I, II and III mean?
Packing group I means high danger, II medium danger and III low danger. The packing group determines which packagings may be used and which quantity limits apply.
What do the numbers on an orange plate mean?
On a tank or bulk transport, the orange plate shows the hazard identification number at the top and the UN number at the bottom. For petrol that is 33 above 1203: 33 means highly flammable liquid, 1203 identifies the substance. Vehicles carrying packaged dangerous goods usually show a blank orange plate.