A valid Fitness Certificate is one of the key documents required for the renewal of a commercial driving licence for an HMV (Heavy Motor Vehicle).
The Fitness Certificate certifies that the vehicle meets all safety and operational standards and is fit for road use.
It is a mandatory compliance document to ensure road safety and environmental standards are upheld.
Without a valid fitness certificate, the vehicle cannot legally be operated, and the driver cannot renew the commercial driving licence.
Other documents like insurance or pollution certificates are important too, but the Fitness Certificate directly confirms the vehicle’s roadworthiness, which is essential for renewal.
Therefore, the correct answer is Fitness Certificate.