This report is devoted to the question of finding the most cost-effective way of optimising the control of noise emitted by vehicles in the important urban environment. It considers whether it is realistic to predict the noise level inside a residence from the external measured noise emission. It also examines whether subjective preference for internal noise can be adequately predicted solely from external noise measurements, or whether an alternative approach is required. The study used 28 subjects for pair comparison subjective experiments concerned with noise at the facade and noise indoors. Four urban main-road sites were considered. It was found in each case that the sound level dba leq of the noise stimulus measured at the point ofassessment correlated well with the subjective preference scales, both externally and internally. However, there was no significant correlation of the internal preference scaleswith the external measured stimulus. This result was due tothe widely differing transmission characteristics of the building structure on the four sites measured, and suggests that the design of the structure is at least as important incontrolling the noise level inside the building as the external noise spectrum. A study was made of the correlation between the measured sound level results for four vehicles according to procedure 70/157/eec, which is currently used for legislative purposes, and the maximum level measured outside the building and the maximum level inside. It was found that the maximum level outside the building correlated well but the correlation with the measured indoor level was not significant. The conclusion from this work is that further reduction in the maximum noise levels permitted by existing procedures to national standards would, in general, lead to improvements in subjective assessment of the noise level outside urban buildings. Further improvement of the noise level inside buildings would be better achieved through controlling the noise transmission through the building facade, rather than devising an alternative, arbitrary test procedure using assumed building transmission characteristics. (TRRL)

  • Corporate Authors:

    Motor Industry Research Association

    Watling Street
    Nuneaton CV10 0TU, Warwickshire,   England 
  • Authors:
    • CALLOW, G D
    • Hedges, R
  • Publication Date: 1980

Media Info

  • Features: Figures; Photos; References;
  • Pagination: 87 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00341118
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: Monograph, HS-032 888
  • Files: HSL, ITRD, TRIS
  • Created Date: Oct 28 1982 12:00AM