Although the 93,600 cards in circulation can now be used only on NZ Bus services, machine readers have been installed at railway stations and ferry terminals, ready for use on trains and ferries from the middle of this year.
Instead of exposing the public to potential teething troubles from day one, Auckland Transport has decided to conduct an extended field trial of the wider system over the next few months with selected users such as its own staff.
Its integrated fares system programme director, Greg Ellis, said that type of "closed pilot" followed international best practice for introducing new public transport ticketing systems.
Five other companies representing most of the rest of the region's bus operations have also signed an agreement for the supply of hardware to enable Hop cards to be used on their services by the end of the year.
These will be plugged into a system being developed by the French electronics giant Thales under an $87 million supply and operating contract with Auckland Transport.
The Government's Transport Agency, which hopes to develop the system into a platform for schemes in other cities, is contributing $56 million.
That has left Auckland ratepayers covering the remaining $31 million, plus $11 million for extra civil work which was needed for cable connections to the train stations and ferry terminals.
NEW REGIME
* Free rides on the City Link bus service have been stopped.
* Passengers without Hop cards will now have to pay.
* Trips will cost 50c for adults and 30c for children.