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How often do you have to renew your endorsement to carry dangerous goods?
运输危险品的驾驶资格签注，需要多久续期一次？
A dangerous goods D endorsement is valid for 5 years and must be renewed as required.
D危险品签注有效期为5年，须按要求续期。
阅读相关知识
Its expiry date is separate from the driver licence expiry date. A current driver licence does not keep an expired D endorsement valid.
签注到期日与驾驶执照到期日分开，不能只因驾照仍有效就继续使用已过期的D签注。