The aim of this pilot study was to test and evaluate basic instruments and methods for infrasonic measurements as well as to collect information about the existence of infrasound in passenger cars. Three different weighting functions with respect to the important frequencies were used when calculating the overall infrasound levels. Relatively similar overall levels were obtained irrespective of what weighting function was used. The infrasound level was in the range 101-106 db(il) and vehicle speed 90 km/h, all windows closed. The corresponding levels were 114-121 db(il) when one side window was half open. The results imply that the Swedish maximum limit for infrasound exposure in working environment (110 db(il)) is not exceeded in any tested vehicle when driving with closed windows, while the limit is exceeded in all tested vehicles when driving with one side window half open. If the maximum limit of 110 db(il) should be respected, the high levels of infrasound might have consequences for certain categories of professional drivers during summertime when it is common to have side windows open during high or medium speed driving. Finally, it is concluded that wind speed is influencing infrasound measurements seriously. (TRRL)


  • Swedish

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 26 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00309083
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Report/Paper Numbers: NR 149 Monograph
  • Files: ITRD, TRIS
  • Created Date: Apr 22 1980 12:00AM