Download Environmental Noise Management Manual PDF

TitleEnvironmental Noise Management Manual
TagsDecibel Sound Noise Road Surface Road
File Size1.5 MB
Total Pages206
Table of Contents
                            Front cover
Foreword, table of contents, introduction and list of acronyms
	Introducing the Environmental Noise Management Manual
	Acronyms and abbreviations
The RTA's corporate commitment and guiding principles to minimise noise
Part I:  Introduction to noise control techniques
	1   An introduction to noise 3
	2   An overview of noise management issues and techniques 9
	3   Techniques for reducing traffic noise at the source 12
	4   Techniques for reducing traffic noise during propagation 16
	5   Techniques for controlling construction and maintenance noise and vibration 22
Part II:  Framework for noise and vibration management
	6   Legislative frameworks and noise and vibration criteria, standards and guidelines 27
	7   Processes to manage traffic noise from new and upgraded roads  33
	8   Noise Abatement Program for existing roads  52
	9   Managing construction noise and vibration impacts 66
	10   Maintenance works 74
	11   Management of vehicle noise at the source 77
Part III:  Guidelines and supporting procedures
	Practice Note I   Determining which noise level criteria apply for new roads and road upgradings 79
	Practice Note II   Responsibilities for ameliorating road traffic noise from new and upgraded roads 87
	Practice Note III   Protocol for assessing maximum noise levels  90
	Practice Note IV   Selecting and designing 'feasible and reasonable' treatment options for road traffic noise from 'new' and 'redeveloped' roads affecting residential land uses  95
		Practice Note IV(a)   Noise barrier heights 106
		Practice Note IV(b)   Acoustic treatment of individual dwellings 110
		Practice Note IV(c)   Worked exam ples of the selection and design of treatment options 116
	Practice Note V   Selling RTA land exposed to road traffic noise 145
	Practice Note VI   Noise and Vibration Management Plans 147
	Practice Note VII   Road works outside normal working hours 151
	Practice Note VIII   Post-construction noise monitoring 154
	Practice Note IX   Noise and vibration complaints 156
	Practice Note X   Land-use planning and Local Area Traffic Management schemes 159
	Practice Note XI   Engine brake signs 165
Appendices:  Model consultant briefs
	A   Model consultant brief for assessing likely traffic noise from new and upgraded roads  168
	B   Model consultant brief for assessing the likely noise and vibration impacts of construction works  175
	C   Model consultant brief for construction and/or maintenance noise monitoring 179
	D   Model consultant brief for vibration monitoring and impact assessments 183
	E   Model consultant brief for post-construction road traffic noise monitoring 187
	F   Model consultant brief for assessing road traffic noise from existing roads 191
Document Text Contents
Page 1


Management Manual


Roads andTraffic Authority


Page 103

• Community views and wishes

• Visual impacts

• Existing and future noise levels, including changes in noise levels, and

• The benefits arising from the proposed road or road redevelopment.

In many cases existing road traffic noise levels will already be above the ECRTN
targets. In these cases, the ECRTN provide allowances over the existing noise
levels, as listed in column 4 of Table 1 of the ECRTN, and the primary noise
objective for any proposal will be, as a minimum, to contain any increases in
noise impact to within these ECRTN allowances. However, all “feasible and
reasonable” mitigation opportunities should still be explored, to endeavour to
reduce existing noise levels towards the target noise levels.

As specified in Section 7, potential noise mitigation strategies and designs
need to be identified, developed and assessed throughout the road develop-
ment process, right from the initial strategic and concept stages through to the
detailed design stage and project opening.

Road design noise control features will generally have been evaluated during
the preparation of the Preferred Option Report and refined during initial concept
design development (see Section 7). This evaluation will have included an
economic analysis consistent with the RTA’s Economic Analysis Manual and
consideration of all other issues pertaining to “feasibility” and “reasonableness”.

These road design features may include:

• Adjustments to vertical and horizontal alignments

• Tunnels and acoustic enclosures

• The development of partnerships for the utilisation of airspace above
roads for acoustically designed land use developments

• Road gradient modifications

• Traffic management, and

• Alternative design speeds.

The process described in this Practice Note aims to provide a consistent
approach to the evaluation, selection and design of the most appropriate mix of
noise control options in addition to these road design features, at locations
where the road design features will not be sufficient, by themselves, to reduce
noise levels to within the ECRTN goals.

These additional noise control options include noise barriers/mounds, archi-
tectural treatments and quieter pavement surfaces.

This Practice Note will generally apply:

• During the final stages of project concept design development, for
inclusion in the concept design report and the EIS or REF, and

• Later during the project’s detailed design.

The process may also be applied if a re-evaluation of the noise treatments
provided is considered necessary, upon analysis of the results of post-construc-
tion noise monitoring.

96 — RTA Environmental Noise Management Manual

Page 104

The ECRTN recognise that in some instances, the application of all available
“feasible and reasonable” noise control options may still be insufficient to
reduce noise levels to within the ECRTN targets. In these situations, there will
also be a need to rely on long-term strategic measures, such as:

• Improved land use planning, design and construction (see Practice Note

• Reduced vehicle emissions through new vehicle standards and the regu-
lation of in-service vehicles (see Section 11)

• Greater use of public transport, and

• Alternative methods of freight haulage.


The process described below is summarised in a flow chart at the end of this
Practice Note. Worked examples are included in Practice Note IV(c).

Step 1:
Define the road traffic noise catchment area

For the purposes of this methodology, and regardless of the target noise levels
set out in the ECRTN, the road traffic noise catchment area to be assessed is
generally defined as all the area of land within the closer of:

• The LAeq(15hr) 55 dB(A) (day) or LAeq(9hr) 50 dB(A) (night) contour,

• The noise level contour beyond which the proposed new road or road
redevelopment will have no effect,

in each case with no noise mitigation in place.

The road traffic noise catchment area will generally not extend beyond a
setback of 300 m from the road alignment, as beyond this distance most noise
models are not capable of producing reliable predictions.

Step 2:
Identify all noise-sensitive receivers within the noise catchment area

• Divide the overall catchment area into sub-catchments likely to have
similar noise exposures, on the basis of factors such as topography, the
road’s design (cuttings, embankments, intersections, etc), setbacks and
types of residences and other noise receptors.

• Further divide the sub-catchments into segments of similar noise
impact, approximately within a 5 dB(A) range.

• On a plan, identify all individual dwellings and other noise-sensitive
receptors in each segment of the project catchment area.

Each affected dwelling in buildings containing multiple residences
should be considered separately.

RTA Environmental Noise Management Manual — 97









Page 206


Roads and Traffic Authority

New South Wales,Australia

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