Transport Minister Steven Joyce says candidates for the Auckland mayoralty need to consider who will pay for promises being made on the campaign trail.
Mr Joyce told a conference in Auckland on Thursday that talk of a rail link to Auckland's North Shore or the airport could be some way off in the future.
Mayoral candidate Andrew Williams wants a rail tunnel built within eight years, while all the leading candidates are keen on a link to the airport.
Mr Joyce says many roading projects are still to be built and should come before any talk of new rail projects.
