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Project introduction

20Connect will improve journey reliability along State Highway 20, State Highway 20A and State Highway 20B to provide more choice for people when travelling around southwest Auckland, including to and from the airport.

Project update

In accordance with the Government guidance, current improvement works on SH20B are not seen as essential services and will be stood down while Auckland is at Alert Level 4. We will keep you updated.

The completion of improvements to SH20B marks a significant milestone to support clean, green transport networks in Auckland

On Friday 16 April, many residents and guests celebrated the opening of improved State Highway 20B following 15 months of the construction works including night time closures.

The state highway still has more works including landscaping before it will be fully completed but it will not disrupt day-time traffic.

Waka Kotahi NZ Transport Agency would like to thank the residents along SH20B and all road users for your patience and support for the improvement works.

  • Project type

    Infrastructure upgrade, Public transport, Road improvements, Walking & cycling
  • Project status


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Night works on SH20B

Our normal working hours for the SH20B project are between 7am and 5pm from Monday to Saturday. However, we are expanding our working hours into the night for timely completion of the project.

The night works ease pressure off the network, minimise disruption during peak hours and offer a safer working environment for construction staff.

If this work is delayed due to weather or any unexpected road conditions it will roll to the next fine night. We apologise in advance for any inconvenience and will use best industry practices to minimise disruption.

As a live construction site, the speed limit is 50km/h. Please drive with care and watch out for people walking and on bikes.

For more information, see the weekly timetable below:


State Highway 20B night works (9pm – 5am)

(Tom Pearce roundabout to SH20 Interchange)

Sundays – Thursdays

Traffic management in place

Video showing night work on SH20B

Working at night is a win win for Waka Kotahi and its contractors. SH20B, part of the Southern Gateway Programme is a good example, the teams working on the project have been making great progress by fully shutting down the road five nights a week. It minimises disruption on the network, and offers a safer working environment for our team.


Project overview

20Connect will improve journey reliability along State Highway 20, 20A and 20B and provide more choice when travelling around southwest Auckland, including to and from the airport.

Improvements identified on the state highway network will enhance the public transport system, cater for freight and cyclists and improve access to growth areas adjacent to the state highway.

20Connect is part of a wider programme of works called the Southwest Gateway. This programme is being carried out by the Transport Agency, Auckland Transport and Auckland Airport.

  • Video

    An overview of the Southwest Gateway Programme


Project area map

Map showing project area.

We will identify how we can

  • improve capacity and connections on or beside the state highways
  • for private vehicles, public transport, walking and cycling
  • improve safety
  • reduce the effects on the environment and treasured places/taonga
  • identify ways to better manage traffic flow on the network
  • maximise the use and reliability of the existing network and its ability to cope with unplanned events.

Project stages

The project will be delivered in stages over the next 20 years.

Stage 1: Early Improvements by 2020/2021:

  • priority lanes to increase the efficiency and reliability of public transport and that will connect with improvements at Puhinui Station
  • new intersections on SH20B to improve access and safety
  • improved walking and cycling facilities, localised road widening and resurfacing, drainage and stormwater treatment on SH20B.

Stage 2: Long-Term Improvements from 2021:

  • state highway widening to support rapid transit
  • increased access to the state highways to free up local roads.

Current issues

  • It is difficult to estimate how long the journey to this area will take, this needs to be more reliable for both people and goods.
  • People have limited options as to how they travel to and from this area, people need to have more choice.
  • There is extensive growth planned in this area. This growth will increase the pressure on the state highways. The capacity, connections and management of the network needs to be improved to support the planned growth no matter how people choose to travel.

What will be investigated?

The 20Connect project will develop a single stage business case to identify ways to address these issues. Potential improvements that will be investigated will include:

  • Improving the capacity and connections on, around or alongside the state highways for cars, trucks, buses and bicycles.
  • Optimising the existing network.
  • Providing more choices as to how people and goods travel to and from this area.
  • Identifying ways to influence the demand on the network.
  • Ways to help people planning their travel and choosing travel options.

We expect the single stage business case to be completed by late 2018.

Early improvements

While we’re busy identifying improvements to deliver in the longer-term, we know there are some issues people are experiencing right now that need to be addressed.

We’ve identified that providing bus priority along SH20B can give immediate benefits to people travelling in this area. These improvements will connect with other early improvements identified with the Airport to Botany Rapid Transit project(external link) and make the most of existing infrastructure and services to improve travel choices and journey experiences. We aim for these to be delivered by 2020/2021.