NZS 6806: 2010 Acoustics Road-traffic noise New and altered roads - - PowerPoint PPT Presentation

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NZS 6806: 2010 Acoustics Road-traffic noise New and altered roads - - PowerPoint PPT Presentation

May 14, 2023 306 likes •689 views

NZS 6806: 2010 Acoustics Road-traffic noise New and altered roads AN OVERVIEW NZTA WORKSHOPS AUGUST AND SEPTEMBER 2010 Rob Hannaby Senior Environmental Specialist Highways and Network Operations Professional Services NZ

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NZS 6806: 2010 Acoustics – Road-traffic noise – New and altered roads

AN OVERVIEW NZTA WORKSHOPS – AUGUST AND SEPTEMBER 2010 Rob Hannaby – Senior Environmental Specialist Highways and Network Operations Professional Services

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NZ LEGISLATION

  • Land Transport Management Act (LTMA) 2003
  • ‘contribute to an affordable, integrated, safe,

responsive, and sustainable land transport system’

  • ‘improves social and environmental responsibility in

land transport funding, planning and management’

  • Resource Management Act (RMA) 1991
  • ‘seeks to promote sustainable management of natural

and physical resources

  • requires avoiding, remedying or mitigating any

adverse effects of activities on the environment’

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NZ POLICY

Government Policy Statement NZTA State Highway Environmental Plan NZ Transport Strategy NZTA Statement of Intent

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WHY DEVELOP A STANDARD?

  • Public health issue
  • No National Environmental

Standard

  • Part of a package of work

approved by Government in 2006

  • Intended to address land

transport noise in an integrated manner

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SITUTATION UPTO APRIL 2010

Transit NZ Guidelines for the Management of Road Traffic Noise 1999

  • De facto national standard
  • Applies to state highways only
  • Based on ambient noise + criteria
  • Challenging criteria for new roads

where low ambient noise

  • Lack of integrated design leading to

debatable value-for-money solutions

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NZS 6806 DEVELOPMENT COMMITTEE

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OUTCOME STATEMENT

This Standard will assist road controlling authorities, developers, and consent authorities to manage the effects

  • f road traffic noise from new and altered roads through the

provision of consistent procedures and requirements for the measurement, prediction, assessment and mitigation of such noise. This will help to achieve quicker and consistent decision- making nationally.

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SCOPE

  • New and altered roads but NOT existing roads
  • State highways and local roads
  • Addresses adverse effects of road traffic noise on people
  • Consistent procedures for the measurement, prediction,

assessment and mitigation of road traffic noise

  • Should be cited in RMA planning and policy documents
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NZS 6806: 2010 ACOUSTICS – ROAD TRAFFIC NOISE – NEW AND ALTERED ROADS

  • Published 30th April 2010
  • Process based standard
  • Based on concept of ‘Best

Practicable Option’

  • Three categories of noise

criteria

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LIMITATIONS

  • Existing roads (not being altered)
  • Roads with AADT < 2000 vpd
  • Maintenance works
  • Construction noise
  • Individual vehicle noise
  • Protected premises and facilities;
  • > 100m from road edge in

urban areas and

  • > 200m from the road edge in

rural areas

X

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ROAD TRAFFIC NOISE DESCRIPTOR

LAeq(24hr)

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NZS 6806:2010 – NOISE CRITERIA

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BEST PRACTICABLE OPTION

A B C

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DEFINITIONS

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NEW ROAD

Any road which is to be constructed where no previous formed legal road existed……. includes the formation of any previously unformed legal road

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NEW ROAD – NOISE EFFECTS

New road must cause current ambient noise level to increase by at least 3 dB LAeq(24h) at design year without mitigation

10 20 30 40 50 60 70 Before After LAeq(24h)

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ALTERED ROAD

  • Existing road subject to

alteration of horizontal or vertical alignment

  • Excludes;
  • Resurfacing
  • Surface treatment
  • Rehabilitation
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ALTERED ROAD – NOISE EFFECTS

  • Road traffic noise at design

year must be either:

  • >= 64 dB LAeq(24h) and

alterations increase noise without mitigation by 3 dB LAeq(24h) or;

  • >= 68 dB LAeq(24h) and

alterations increase noise without mitigation by 1 dB LAeq(24h)

www.acoustics.nzta.govt.nz

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PROTECTED PREMISES AND FACILITIES

Residential properties Schools Hospitals Hotels and motels Marae

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ASSESSMENT AREA

All protected premises and facilities in an urban area within 100m; or rural area within 200m;

  • f the edge of the closest traffic lane of the new or altered road
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ASSESSMENT POSITION

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DESIGN YEAR

Between 10 and 20 years after opening of new road or altered road

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STRUCTURAL MITIGATION

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BUILDING MODIFICATION MITIGATION

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STRUCTURAL MITIGATION PERFORMANCE

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CLUSTER

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MONITORING

  • Based on requirements of NZS 6801:

2008 ‘Acoustics – Measurement of environmental sound’

  • Specific requirements for measuring:
  • Road traffic noise
  • Ambient sound
  • Internal noise (based on ‘standardised

level difference’ method described in ISO 717-1:1996)

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PREDICTION

  • Based on UK methodology

‘Calculation of Road Traffic Noise (CoRTN) adjusted to NZ condition

  • Roading project noise models

should be verified against measured noise levels (± 2 dB)

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ASSESSMENT PROCESS

1. Does the standard apply? 2. What are the relevant noise criteria? 3. Is mitigation required? 4. Develop mitigation options 5. Determine best practicable mitigation option

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OPTION DEVELOPMENT

Low noise road surface, noise barriers and acoustic insulation 3 Noise barriers and acoustic insulation 2 Low noise road surface and noise barriers 1 Mitigation Option No.

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ACOUSTICS OPTION ANALYSIS

Option 1 Option 2

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BENEFIT-COST OPTION ANALYSIS

0.00 0.50 1.00 1.50 2.00 Option 1 Option 2 Option 3 Option 4 $0.00 $500,000.00 $1,000,000.00 $1,500,000.00 $2,000,000.00 $2,500,000.00 $3,000,000.00 Option 1 Option 2 Option 3 Option 4 NZ$ Costs Insulation Costs Barriers Costs Road Surface

Benefit-Cost Ratio Comparison Cost Comparison

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MULTI-DISCIPLINARY OPTION ANALYSIS

  • Options reviewed and

rated by a range of specialists, e.g. visual, urban design, safety, heritage, etc.

  • Options ranked
  • Preferred [best

practicable] option identified

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DESIGNATION CONDITIONS

  • ‘Future Build / Route Protection’

designation

  • Conditions likely to require NZS

6806 process to be repeated closer to construction as part of Outline Plan of Works process

  • ‘Build’ designation
  • Condition likely to detail form of

best mitigation option

  • Variation process will need to be

included

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NZTA POLICY

  • NZS 6806: 2010 adopted with

immediate effect

  • Subject to two year value-for-

money monitoring period

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NZS 6806: 2010 v TRANSIT NOISE GUIDELINES

  • New roads developed in urban areas –

costs are likely to reduce.

  • Major alterations to existing roads in urban

areas – costs are likely to increase.

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THANK YOU

Rob Hannaby Senior Environmental Specialist NZ Transport Agency Highways and Network Operations Professional Services rob.hannaby@nzta.govt.nz