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<p>The Department for Transport guidance sets out how we should consider optimism
bias when appraising transport schemes. In the case of Heathrow expansion, we estimated
noise impacts using a central demand scenario in order to provide estimates consistent
with the rest of the appraisal. In order to test worse case impacts, a higher demand
scenario was used in the revised Appraisal of Sustainability (AoS).</p><p> </p><p>The
2014 Survey of Noise Attitudes (SoNA) recognises that attitudes towards aviation noise
are changing. The work carried out during the SoNA study shows that sensitivity to
aircraft noise has increased, with the same percentage of people being highly annoyed
at lower levels of noise than in a past study. As a result, the Government has introduced
new metrics and appraisal guidance to assess noise impacts and their impacts on health
and quality of life. This will ensure that the noise impacts of proposed airspace
changes are considered much further away from airports than at present.</p><p> </p><p>The
Independent Commission on Civil Aviation Noise (ICCAN) began work earlier this year,
and will focus on developing best practice guidance in aviation noise management.</p><p>
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