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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). The section of state highway between Linden and Mackays Crossing was renumbered State Highway 59 (SH59) on 7 December 2021.

Waka Kotahi and Porirua City Council sought feedback on the proposed speed limits for those parts of SH1 and SH59 that have been realigned or built as part of the motorway construction, motorway on and off-ramps, and the new Porirua link roads.

Before speed limits can be confirmed, formal consultation on the new speed limit proposals is required under the Land Transport Rule: Setting of Speed Limits 2017.

Land Transport Rule: Setting of Speed Limits 2017

Waka Kotahi sought public input into proposals to set permanent speed limits for State Highway 1 and State Highway 59. Submissions closed on Tuesday 27 July 2021.

Based on the feedback received during consultation, the following speeds have been set as the new permanent speed limits. 

At this time an implementation date has not been set but these limits will be in place on formal opening of State Highway 1 Transmission Gully. There will be at least 10 working days between this notification and implementation as set out the Setting of Speed Limit Rule 2017.

State Highway

 Location

Existing Speed Limit

New Speed Limit

SH1TG

Southbound – from 100m north of Kenepuru off-ramp TG to SH1 Helston Road overbridge

N/A and 100km/h

30 /40 /50 /60 /70 /80 or 100km/h VSL

SH1TG

Mackays northbound off ramp; from 100m south of intersection of State Highway 59 to the end of the off ramp.

N/A

80km/h

SH1TG

Mackays southbound off ramp: from 100m north of the Whareroa Road / Emerald Glen Road roundabout to the end of the off-ramp.

N/A

80km/h

SH1TG

Paekākāriki southbound off-ramp and underpass road; from 100m north of Paekākāriki roundabout to the intersection with SH59

N/A

80km/h

SH1TG

Pāuatahanui southbound off-ramp; from 100m north of SH58 roundabout to the end of the off-ramp.

N/A

80km/h

SH1TG

Pāuatahanui northbound off-ramp; from 100m south of SH58 roundabout to the end of the off-ramp

N/A

80km/h

SH1TG

Waitangirua southbound off-ramp; from 100m north of Waitangirua Link Road roundabout to the end of the off-ramp

N/A

50km/h

SH1TG

Waitangirua northbound off-ramp; from 100m south of Waitangirua Link Road roundabout to the end of the roundabout

N/A

50km/h

SH1TG

Kenepuru southbound off-ramp; from 100m north of the Kenepuru Link Road roundabout to 100m from the end of the off-ramp at the Kenepuru Drive roundabout

N/A

60km/h

SH1TG

Kenepuru southbound off-ramp; from 100m from the Kenepuru Drive roundabout to the end of the off-ramp.

N/A

50km/h

SH59

Mackays Crossing roundabout to 450m north of Beach Road.

N/A and 80km/h

80km/h

SH59

Mungavin Southbound main alignment to the Linden merge with Transmission Gully SH1

100km/h

30 /40 /50 /60 /70 /80 or 100km/h VSL

State highway speed limits

Waka Kotahi is introducing 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 the Helston Road overbridge at Johnsonville.

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

A VSL allows Waka Kotahi to adjust the speed limit and help 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 will be progressively installed, however Waka Kotahi will 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 speed limits that were consulted on 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.

Consultation and submissions

On 28 June 2021, Waka Kotahi consulted on proposed speed limits for parts of SH1 and SH59. Consultation was open for four weeks and closed on 27 July 2021.

During consultation we received 34 submissions from private individuals, road user groups and community organisations. We appreciate the response from the community and thank everyone who provided feedback.

The submissions did not identify any issues that Waka Kotahi had not already considered.