Part C Assessment Page C-11
C3.3 Acoustic Effectiveness

The type of ground surface over which road traffic noise travels has a substantial effect on noise attenuation, particularly over large distances. Areas covered with grass or other types of ground covers are more absorptive
than hard, paved surfaces or bodies of water, these tend to reflect noise. Dense plantings of trees with an understorey of shrubs may result in a reduction of 3 dB(A) per 30 metres of width (Harris, 1988).

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