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The type and condition of a road surface can have a noticeable effect on the noise levels experienced by residents adjacent to state highways.

Guide

We have prepared a Guide to state highway road surface noise to aid our staff and contractors with the design, construction and maintenance of road surfaces. This guide has been produced to inform roading practitioners, contractors and the public about how road surfaces affect noise levels and what low-noise road surfaces are available in different situations. Information is also provided on maintenance issues and basic engineering considerations.

Guide to state highway road surface noise

Additional information on low-noise road surfaces is available in:

Case studies

Case studies on projects involving road surfaces are available to supplement those discussed in the guide. The case studies report on key lessons learnt from Waka Kotahi NZ Transport Agency projects for the benefit of future projects.

Paving - Papakura interchange upgrade, Auckland - October 2014 [PDF, 810 KB]

Specification

Our requirements for low-noise road surfaces are included in the P40 specification.

NZTA P40: 2014 - Specification for noise mitigation [PDF, 86 KB]

Road surface noise research

Note that the instrumentation and analysis have been refined over the course of this research programme. Some of the absolute levels reported in these reports need to be adjusted before comparing to other ISO standard measurements.

Title

Date

Author

Summary of CPX measurements [PDF, 23 MB] 18 August 2021

Altissimo Consulting Ltd

Porous asphalt surface noise trials - summary of close proximity (CPX) testing results [PDF, 621 KB] 20 January 2021 Waka Kotahi NZ Transport Agency

Road surface noise – texture relationships Interim progress report [PDF, 1.8 MB]

6 July 2020

Altissimo Consulting Ltd

Measurement of asphalt thickness [PDF, 461 KB]

30 June 2020

WSP

Chipseal trial strategy [PDF, 765 KB]

30 June 2020

WSP

Tyre/road noise contribution from heavy vehicles [PDF, 1.3 MB]

30 June 2020

WSP

Road surface noise – influence of axle motion on CPX level [PDF, 5.2 MB]

1 May 2020

Altissimo

Initial review of aggregates with respect to road traffic noise [PDF, 823 KB]

15 April 2020

WSP

Drive-by vehicle noise [PDF, 1 MB]

February 2000

Opus

Road surface noise research porous asphalt variability study – final report [PDF, 11 MB]

24 January 2020

Altissimo Consulting Ltd

Masterton chipseal trial tyre/road noise measurements [PDF, 6.4 MB]

4 September 2019

Altissimo Consulting Ltd

Road surface noise - measurements of porous asphalt on the Auckland motorways [PDF, 12 MB]

11 July 2019

Altissimo Consulting Ltd

NZTA road surface noise research programme 2018/2019 – preliminary chipseal study [PDF, 625 KB]

11 July 2019

WSP

Road surface noise research porous asphalt variability study – preliminary results [PDF, 9.3 MB]

30 June 2019

Altissimo Consulting Ltd

NZTA road surface noise research programme 2018 – CPX versus wayside measurements [PDF, 901 KB]

30 April 2019

WSP

Road surface noise measurements of porous asphalt on the Waikato Expressway and Tauranga Eastern Link [PDF, 6.5 MB]

17 January 2019

Altissimo Consulting Ltd

Road surface noise research 2016-2018 (CPX trailer development and initial measurement results) [PDF, 4.3 MB]

April 2018

Waka Kotahi NZ Transport Agency

Low-noise road surfaces performance monitoring [PDF, 1.6 MB]

February 2014

Opus

Research Report 326 Road surface effects on traffic noise – stage 3: selected bituminous mixes [PDF, 309 KB]

2007

Opus

Research Report 292 Road traffic noise: determining the influence of New Zealand road surfaces on noise levels and community annoyance [PDF, 386 KB]

2006

Opus

Research Report 083 Road noise generated by concrete block pavements [PDF, 1.5 MB]

1997

Opus

Close proximity (CPX) monitoring trailer guidance/information

Title

Date

Author

CPX road surface noise measurement trailer guide [PDF, 2.2 MB]

April 2018 

Waka Kotahi NZ Transport Agency

CPX trailer instrumentation specifications [PDF, 603 KB]

13 July 2017 

Waka Kotahi NZ Transport Agency

For further information contact environment@nzta.govt.nz.