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Project introduction

The NZ Transport Agency and its council partners are investigating ways to make State Highway 58 between SH2 and the Pauatahanui roundabout safer for everyone who uses it.

  • Estimated project dates

    Nov 2014–Apr 2020
  • Estimated project cost

    $45 million–$55 million
  • Project type

    Road improvements
  • Project status


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The NZ Transport Agency has been investigating how to improve safety on State Highway 58. Over the past 10 years there have been over 200 crashes causing four deaths and 17 serious injuries on the section of SH58 between State Highway 2 and the Pauatahanui roundabout. SH58 is a challenging road to drive. The road is narrow with tight, difficult curves, and many access points and intersections.

The NZ Transport Agency is committed to improving safety on SH58. In 2014 we consulted with the community on a package of safety improvements. We received a lot of feedback on how we could improve our proposal.

Since the 2014 engagement, we have addressed some safety concerns by straightening some curves at Haywards Hill.  We have also taken that feedback on board and significantly expanded the scope of the project so that we will achieve greater safety outcomes than the original proposal.

Project objectives

  • to enhance safety of travel on the Wellington state highway network, and specifically SH58
  • to maintain or improve journey times and journey time reliability between SH2 in the Hutt Valley and Transmission Gully
  • to enhance resilience of the Wellington state highway network
  • to appropriately balance the needs of local and state highway traffic.

About the project

The expanded package of safety improvements will:

  • Separate traffic

    We propose to widen the highway and four bridges and install a wire rope safety barrier between the opposing lanes of traffic from SH2 to Bradey Road. There will be gaps in the barrier to provide access at:

    • Hugh Duncan Street
    • Kaitawa Street/Transpower
    • Mt Cecil Road
    • Harris Road
    • Moonshine Road roundabout
    • Flightys/Murphys roundabout.

    When the safety barrier is put in place some right turns will be removed and some of the roads that connect to State Highway 58 will become left in/left out only. Some people will have little change to their access, while others may need to travel a few minutes longer to reach their destination.

    We know that any change of access can be inconvenient. However, convenience must be weighed against the numbers of deaths and injuries that have occurred on SH58 to ensure we get the right balance between safety and convenience.

  • Safer intersections

    We propose to limit access on some intersections and build roundabouts at Moonshine Road and the Flightys/Murphys intersection.

  • Straighten curves

    In 2016 we completed work to realign the highway at the site of a dangerous curve between Mt Cecil Road and Harris Road. The next stage includes straightening the curves between State Highway 2 and Mt Cecil Road.

  • Safer speeds

    We propose to lower the speed limit to 80km/h between the SH2 and the Pauatahanui roundabout. Average travel speeds on SH58 are currently 79km/h so the reduced speed limit should not increase travel times.

    The lower speed is more appropriate to the conditions and means all vehicles are traveling at similar speeds, reducing the chance of conflicts.

    We are also working with the Porirua City Council to review and adjust speed limits on roads feeding onto SH58.


SH58 improvements area map

Timeline for improvements

StageIndicative date
Initial investigations 2014
First engagement on proposals Late 2014
Incorporate feedback, realign curve between Mt Cecil Road and Harris Road, confirm plan 2014-2017
Engage on expanded scope Mid-2017
Detailed design, lodge consent applications 2017
Construction (subject to funding approval) 2018 onwards