The vehicle registration system in Hong Kong is independent from those of Mainland China and Macau.

Hong Kong's official UN road code is HK, as of June 2024.

The physical number plates are not provided by the government but are made to order by garages.

During British administration, the vehicle of the Governor bore the St Edward's Crown emblem.

[citation needed] As of January 2025, the current allocated prefix is ZW.

Such arrangement is considered to be able to avoid the need of modifying existing computing systems and laws.

Hence, a unique registration mark without letter prefix could be found on two different types of vehicles.

The proceeds of the auction goes to the Government Lotteries Fund to be used for charitable purposes.

A special registration mark obtained in an auction is not transferable, that is to say, the number can be used only on vehicles registered under the name of the buyer.

Transferring a special registration mark from one vehicle to another is permitted provided that they are both owned by the same person.

To reserve a non-special registration mark for auction, one needs to pay a deposit of HK$1000.

If it is a special registration mark, there is no deposit to pay, and the minimum price will be set by the Transport Department but will be higher than HK$1000.