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Last updated: Tuesday, 15 October 2019

What will the project mean for my property access?

The proposed median safety barrier will mean that some people accessing roads connecting with SH58 and properties on SH58 will need to travel longer on some journeys. We don’t expect additional travel time to exceed more than a few minutes.

When will construction start?

Construction on Stage 1 safety improvements from Haywards Interchange to Mt Cecil Road are underway. Stage 2 work from Mt Cecil Road to Transmission Gully Interchange at Pauatahanui will begin after the opening of Transmission Gully.

How long will construction take?

Construction is being staged with Stage 1 work beginning at Haywards interchange to Mt Cecil Road taking approximately 18 months to complete. Stage 2 construction from Mt Cecil Road through to Transmission Gully Interchange will take approximately 18 months to complete.

Why is the work taking so long to start?

In 2014, and again in 2017, we consulted with the community on a package of safety improvements. We received a lot of feedback on how we could improve our proposal. We have taken that feedback on board and significantly expanded the scope of the project so that we will achieve greater safety outcomes. 

In October 2018 the project was experiencing delays and we became aware that more funding was required to deliver the improvements, which is not unusual for projects like this. Following an internal reassessment of the project, a decision was made in March this year, to get Stage 1 of the project underway.

We are also considering options for interim safety improvements, including suggestions from the local community, for the Stage 2 area of SH58. The interim improvements will be implemented over the next few months.

How do I work with the Transport Agency to ensure my property access meets my needs?

We will work with individual property owners with direct access onto SH58 to determine how best to address their current and future access needs. Some accesses will need to be redesigned and rebuilt as part of the project.

Some of my property may need to be acquired for the project. What is the process?

In New Zealand, the Public Works Act 1981 provides the power to acquire property for public works and also entitles affected land owners to compensation. Land Information New Zealand (LINZ), on behalf of the Crown, is responsible for administering this Act. Further information on the Public Works Act 1981 is available on the LINZ website(external link).

We typically buy properties once we have firm land requirement plans in place, and these depend on the outcomes of public engagement, more detailed investigations and consenting. Construction timing is also a consideration.

Where the NZ Transport Agency requires your property for a public work, a LINZ accredited supplier is engaged to carry out the negotiations on its behalf.

If your property, or part of your property, is required for the project, the Transport Agency will pay compensation on the basis of market value. Market value is not the personal value to you or the value to the NZ Transport Agency, but is based on an assessment by an independent registered valuer.

You may also be eligible for additional compensation of up to $50,000, depending on whether there is a dwelling on your property that will need to be acquired and whether that dwelling is used as your principal place of residence.

In addition to the market value of your property, reasonable legal and valuation fees and moving costs are reimbursed by the Transport Agency once they have been approved by LINZ.

If you have a business located on your land, you may claim compensation for business loss resulting from the relocation of the business. The loss may include loss of profits and goodwill, although the loss of profits must relate to proven loss of “actual profits”. Loss of “anticipated profits” is not provided for in the Public Works Act.

If you have any specific questions relating to your property, please get in touch with the SH58 project team at

Aren't flexible safety barriers dangerous for motorcyclists?

Motorcyclists don’t have the same protection in a crash as the occupants of vehicles, and special consideration needs to be given for how to keep them safe. Roadside and median flexible safety barriers are highly effective in preventing deaths and injuries for all road users including motorcyclists.

Research shows installing roadside barriers – particularly flexible road safety barriers – reduces motorcycle casualties between 50-60 per cent. This is because motorcyclists are much more likely to survive an impact with a roadside or flexible road safety barrier than an impact with trees, poles or oncoming vehicles.

For more detail about this safety measure, see our Flexible road safety barriers page.

What are you doing for cyclists?

Surveys have shown that cyclists enjoy using SH58, particularly at weekends.  A consistent shoulder width on SH58 will mean cyclists have more space to travel without being forced into conflict with trucks or other vehicles at pinch points.

Are roadside safety barriers dangerous for cyclists?

While barriers may pose a hazard to cyclists, they are generally protecting against greater hazards on the roadside. The main issue for cyclists is to have enough space to cycle on the road shoulder between the barrier and the traffic lane edge line. We aim to provide cyclists a one metre shoulder plus another half metre of clearance to the barrier.

Was Stage 2 of the safety improvements previously funded?

Funding was set aside for the entire project, based on an estimated cost assessment. As the project has developed, it has become apparent that more funding is required for Stage 2 construction. This is not unusual for projects like this. However funding was approved to advance the necessary preparatory work for Stage 2. This includes funding to progress land acquisitions and consenting work needed for the safety upgrades.

Is SH58 going to be widened by the entrance to the Willowbank Quarry?

The road is going to be widened beside the quarry road entrance and the intersection is being constructed by the Willowbank Quarry consent holder (not the NZ Transport Agency). However the Transport Agency’s road safety team has reviewed the intersection design, as required for any work carried out on the network.

The intersection will allow for left turning vehicles. There will also be a right turning bay for trucks to turn from SH58 into the quarry road.

Has lowering the speed limit to 80km/hr been reflected in vehicle speeds?

Yes there has been reduction in the speed being travelled by the fastest motorists, while the average speeds along the highway have been maintained at just under 80km/h.