Under ADR 6.8.2.4.4, if a tank vehicle suffers severe damage to its shell in an accident, what must occur before it is returned to dangerous goods service?

1. An exceptional inspection (repair inspection) must be performed by an approved inspection body
2. The driver must conduct a visual check of cab lights
3. The consignor must sign a temporary waiver
4. The vehicle must be driven 100 miles on motorway test