A new link in the motorway network in Auckland is now open.
The new 4.5km link between State Highways One and 20 eliminates a dozen traffic lights.
It will also serve as a gateway to the western ring route that will link Manukau with Albany.
Southbound lanes at Manukau opened from 7am on Sunday with speed restrictions.
The Transport Agency says the extension will have immediate benefits for businesses and residents once it is fully operational by Christmas.
It says the extension will improve access to and from Auckland international airport for the 85,000 visitors who will arrive for the Rugby World Cup and give another route to Eden Park and other venues.