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How often do you have to renew your endorsement to carry dangerous goods?
運輸危險品的駕駛資格簽注，需要多久續期一次？
A dangerous goods D endorsement is valid for 5 years and must be renewed as required.
D危險品簽注有效期為5年，須按要求續期。
閱讀相關知識
Its expiry date is separate from the driver licence expiry date. A current driver licence does not keep an expired D endorsement valid.
簽注到期日與駕駛執照到期日分開，不能只因駕照仍有效就繼續使用已過期的D簽注。