How long is the validity period of an ADR Certificate detailing a driver's training for transporting hazardous goods?

The ADR Certificate, which proves training for transporting hazardous goods, is valid for 5 years. After these 5 years, drivers must complete a refresher course and pass an exam to renew the certificate. This helps ensure that drivers always have up-to-date knowledge about the safe transport of dangerous materials. Remember: the certificate is never valid for an unlimited period or just 3 years; it's always 5 years from the date of issue.