One of Auckland's biggest road-building projects since the harbour bridge is tipped to spark a commercial boom in one of the city's top shopping areas.

Auckland's Northern Gateway toll road lacks back-up generators to keep its tunnels open during long electricity cuts.

It's time to dig out the street maps, as councils take the opportunity of reduced traffic flows over the holidays to get on with road maintenance.

Steven Joyce says the toll on the Transmission Gully route will be no more than $3.

Wellington's mayor lauds a move to proceed with Transmission Gully but her Kapiti counterpart admits to being "extremely disappointed".

The long-awaited Transmission Gully route has been approved as part of a $2.2 billion upgrade of State Highway 1 from Wellington to Levin.

Transport Minister turns first sod for project to speed city motorway travel.