the BRRC and AWV are jointly testing low-screen diffractors along the N445 in Zele

OCW en AWV testen samen diffractoren op laag scherm langs de N445 in Zele

Diffractors are a recent invention that can help reduce traffic noise exposure from homes in the vicinity of arterial roads. They consist of a series of narrow slots of varying depth placed parallel to the axis of the road. Traffic noise propagating along the ground and passing across the diffractor towards nearby houses makes the air in the slots vibrate as if they were long, flat organ pipes. The different slots vibrate at different wavelengths and merge in turn form secondary sound sources, the sound of which deflects the passing traffic noise upwards. This results in a reduction in traffic noise exposure at the level of the houses. At the request of AWV, in the summer of 2019, a 140 m long, temporary arrangement was placed along the N445 in Zele, which has been provided with a recent road surface in diced concrete slabs. The set-up consisted of 1.05 m wide diffractors placed on a 1.10 m high screen (figure 2). The intention was to measure at greater distances and at different measurement heights to determine whether this measure could be useful on regional roads with 2x1 lane and houses in the immediate vicinity.

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  • Authors:
    • Goubert, Luc
    • Vanhooreweder, Barbara
  • Publication Date: 2020-12


  • English
  • Dutch
  • French

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References;
  • Pagination: pp. 26-27
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01762466
  • Record Type: Publication
  • Source Agency: Belgian Road Research Centre (BRRC)
  • Files: ITRD
  • Created Date: Jan 18 2021 8:54AM