Measured light vehicle noise reduction by hedges

van Renterghem, Timothy; Attenborough, Keith; Maennel, Manuel; Defrance, Jerome; Horoshenkov, Kirill; Kang, Jian; Bashir, Imran; Taherzadeh, Shahram; Altreuther, Beate; Khan, Amir; Smyrnova, Julia and Yang, Hong-Seok (2014). Measured light vehicle noise reduction by hedges. Applied Acoustics, 78 pp. 19–27.



The acoustical effects of hedges result from a combination of physical noise reduction and their influences on perception. This study investigates the physical noise reduction so as to enable estimation of its relative importance. Different in-situ methods have been used to measure noise shielding by hedges. These include a statistical pass-by experiment where the real insertion loss of a hedge could be measured, three controlled pass-by experiments using a reference microphone at close distance, and transmission loss measurements using a point source. Thick dense hedges are found to provide a small total A-weighted road traffic noise reduction at low vehicle speeds. Measured insertion losses range from 1.1 dBA to 3.6 dBA. The higher noise reductions are found to be associated with an increased ground effect.

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