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<p>Noise barriers can be very effective in reducing railway noise. Their attenuation
is determined by a variety of factors such as; their dimensions, their design, the
nature of the noise sources and the spatial relationship between the barrier, the
sources and the receiver.</p><p> </p><p>By way of illustration the information in
the table below, which was provided to the House of Commons select committee considering
the Phase 2a Bill, shows attenuation values predicted for noise fence barriers that
are 3 and 5 metres high under the conditions shown in the table.</p><p> </p><p>Noise
mitigation has not yet been designed in detail but as the design of the railway proceeds
noise control measures will be determined to ensure the Environmental Minimum Requirements,
as set out with respect to airborne operational noise in HS2 Phase One Information
Papers E9 and E20, are met.</p><p><strong>Airborne noise levels</strong> from HS2
showing predicted noise fence barrier performance:</p><p> </p><table><thead><tr><td><p><strong>
</strong></p></td><td><p><strong>Distance, m</strong></p></td><td><p><strong>Speed,
km/h (mph)</strong></p></td><td><p><strong>L<sub>pAFMax</sub>, dB </strong></p></td><td><p><strong>Attenuation,
dB(A)</strong></p></td></tr><tr><td><p>HS2 train (on slab track)</p></td><td><p>150</p></td><td><p>360
(225)</p></td><td><p>84</p></td><td><p>N/A</p></td></tr><tr><td><p>HS2 train with
3m barrier (on slab track)</p></td><td><p>150</p></td><td><p>360 (225)</p></td><td><p>72</p></td><td><p>12</p></td></tr><tr><td><p>HS2
train 5m barrier (on slab track)</p></td><td><p>150</p></td><td><p>360 (225)</p></td><td><p>67</p></td><td><p>17</p></td></tr></thead></table>
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