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| Environmental Roads Projects |
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Assessment
of Environmental Noise Impact:
Marshall Day Acoustics has prepared noise impact assessments for the
majority of roading projects in New Zealand and Australia. We have
developed an assessment method which quantifies impact in terms of
community effects such as sleep disturbance, interference with speech
communication and annoyance.Of particular concern is the response of
communities subject to changes in noise environment. Studies have shown
that the response is often much greater than would be predicted from
the steady-state models, and that the response can be very long-lived
amongst people living in the area at the time of the change.
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Road Traffic Noise Control Design:
We have developed a risk analysis approach to noise barrier design
which has led to cost-effective noise barrier solutions on several
major projects. Risk analysis allows a clear discussion concerning
safety factors to take place between the Road Authority, the road
builder and other stakeholders.We have an extensive knowledge of noise
barrier designs, including absorptive barriers, coarse-edge barriers,
absorptive-edge barriers and curved designs, as well as fully-enclosed
and semi-enclosed designs.We have provided acoustic advice on several
projects where innovative approaches to noise control were implemented,
such as Herriott's Glen, where the Quiet House Concept was employed. |
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Review and Validation of Road Traffic
Noise Prediction Models:
Marshall Day Acoustics has been involved in all aspects of the
prediction of environmental noise, including software development,
software beta testing, validation of prediction methods, and, of
course, use of the various models for the design of noise control
measures.We pioneered the use of 3-dimensional computer models for the
prediction of environmental noise and have moved on to provide
distribution and technical support for one of the world's most
sophisticated noise prediction software packages, SoundPLAN.In
Australia, we undertook an extensive research & development
project for VicRoads, in which we reviewed over 30 software packages
and 18 traffic noise prediction methods, evaluated 3 methods in detail
and calibrated one method, the new US Federal Highway Administration
FHWA TNM method, for use in Victoria. |
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Road Traffic Noise Policy Development:
Marshall Day Acoustics' extensive experience in noise prediction,
measurement, assessment and control provides an invaluable basis for
our work in environmental noise policy development.We have assisted the
local Road Authority, VicRoads, both as consultants and as colleagues,
in the review and development of their Traffic Noise Reduction Policy.
Recently, we were selected by Austroads (the national body responsible
for coordinating State Road Authorities) to prepare a brief to develop
a National Approach to Road Traffic Noise Management.One important
aspect of noise policy, the management of noise modelling outcomes,
will be assisted by the new Guide to the Validation of Road Traffic
Noise Models, prepared by Marshall Day Acoustics for Austroads. |
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