What must a driver do if they discover that the UN number or quantity of dangerous goods loaded on their vehicle does not match the details on the transport document?

1. Proceed with the journey but make a hand-written note on the back of the document
2. Refuse to move the vehicle until the transport document has been corrected to match the actual load
3. Change the orange plates on the vehicle to match whatever is written on the document
4. Assume the document is correct and ignore the physical cargo labels