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Project introduction

Waka Kotahi NZ Transport Agency is seeking public input into proposals to set permanent new speed limits for State Highway 1 and State Highway 59, and local link roads connected to Transmission Gully.

  • Project type

    Speed review

Project updates

Setting appropriate speed limits

Speed limits are one way of keeping people safe on the roads. They can also help ensure that the roads are flowing smoothly and connecting well with other parts of the roading network.

On opening, the motorway through Transmission Gully will become State Highway 1 (SH1), and the current section of SH1 between Linden and Mackays Crossing will be renumbered as State Highway 59 (SH59) until a final decision is made on the future of that road.

Formal consultation on the new speed limit proposals is required under the Land Transport Rule: Setting of Speed Limits 2017. Before we make a decision, we want to hear from you on the proposed speed limit changes set out below.

Land Transport Rule: Setting of Speed Limits 2017

There are sections where Transmission Gully connects to the existing network where the default 100km/h speed limit for motorways is not suitable. Waka Kotahi and Porirua City Council seek your feedback on the proposed speed limits for those parts of SH1, the sections of SH59 that have been realigned or built as part of the motorway construction, motorway on and off-ramps, and the new Porirua link roads (as set out in the table below).

State highway speed limits

Waka Kotahi intends to implement a speed limit bylaw for the southbound section of the new Transmission Gully motorway, approaching the southbound merge at Linden, through to the existing SH1 motorway at Helston Road (just north of Johnsonville). This is proposed to be a variable speed limit (VSL) to safely manage southbound traffic where SH1 and SH59 merge, and to ensure safety and efficiency on the section of SH1 to Helston Road.

This would extend the existing VSL currently in place on SH1 from Helston Road to the Terrace Tunnel, all the way to the southern end of Transmission Gully.

A VSL allows the motorway operator to adjust the speed limit to manage incidents on the road or adverse weather conditions that may affect safety of road users. It can also be used to slow vehicles down if there is congestion ahead, or for temporary traffic control.

Electronic VSL signs would be progressively installed, however Waka Kotahi expects to temporarily use static signs approaching the Linden merge point between SH1 and SH59 until it is comfortable with how the network surrounding Transmission Gully is working.

All other proposals in this consultation are to ensure that vehicles are travelling at safe and appropriate speeds when using on and off-ramps connected to the motorway and other sections of state highway. These proposed changes are detailed in the table below.

Local road speed limits

This consultation is also seeking feedback on proposed speed limits for local link roads that have been constructed as part of the project, and those constructed by Porirua City Council. The link roads connect the Transmission Gully motorway with communities in Waitangirua, Whitby and Kenepuru. On some parts of these local roads, the urban boundary means the default speed limit would be 100km/h, which is not suitable. Lower speed limits are proposed as detailed in the table below.

What we’re proposing

Location Current speed limit (km/h) Proposed new speed limit (km/h)
State highways
SH1 Transmission Gully (southbound only) from approximately 100m north of Kenepuru off-ramp to SH1 Helston Road Transmission Gully: n/a

Linden to Helston Road: 100
Variable speed limit: 30, 40, 50, 60, 70, 80, 100
New section of SH59 from Mackays Crossing roundabout to the new SH59 intersection opposite Paekākāriki off-ramp (approx. 1km) Existing road: 80

New road: n/a
New intersection at Paekākāriki from approximately 200m southwest of SH59/SH1 intersection to the start of the Paekākāriki SH1 on-ramp (approx. 400m) 100 80
Paekākariki SH1 southbound off-ramp and underpass, from 100m north of Paekākāriki roundabout to the intersection with SH59 (approx. 250m) n/a 80
Pāuatahanui off-ramps from 100m either side of SH58 interchange roundabouts n/a 80
Waitangirua off-ramps from 100m either side of Waitangirua Link Road roundabouts n/a 50
Kenepuru on-ramp from 20m south of Link Road roundabout to merge with SH1 north of Linden n/a Variable Speed Limit: 30, 40, 50, 60, 70, 80, 100
Kenepuru off-ramp from 100m north of Link Road roundabout to Kenepuru roundabout n/a 60
Porirua City Council local roads
Waitangirua Link Road from 20m north of Link Road roundabout to intersection with Niagara Street and Warspite Avenue (approx. 2km) n/a 50
Whitby Link Road from intersection with Waitangirua Link Road to intersection of James Cook and Navigation Drives (approx. 1.45km) n/a 50
New section of local road at Lanes Flat approximately 200m south of Pāuatahanui roundabout. n/a 60

Public consultation

Waka Kotahi sought public input into proposals to set permanent new speed limits for State Highway 1 and State Highway 59, and local link roads connected to Transmission Gully. Submissions closed on Tuesday, 27 July 2021.

Formal consultation on new speed limit proposals is required under the Land Transport Rule: Setting of Speed Limits 2017.

Land Transport Rule: Setting of Speed Limits 2017

All submissions will now be considered before new speed limits are announced.