The author discusses problems found when using noise contours, suggesting an alternative method for assessing noise impacts. Because a noise "surface" is subject to rapid change and large discontinuities wherever properties are involved, a very large number of calculations is involved other than in the countryside. The method proposed makes specific estimates of the noise in the worst affected window on the worst affected facade of a property. The method can also be applied to pedestrian areas. A computer program (lten) has been written to calculate the noise profile. Input data are required, relating to the road, barriers and the site under consideration. Data also required include reference numbers, the road width, traffic characteristics, information on retained cut, the height of the road above ordinance datum and the height of the road above the surrounding ground. Lten calculates the noise from any road segment at a site and sums the noise from each segment to give the total noise level. An example is given of the type of input required and the form of the computer print-out. It is estimated that the staff time required to study a 21 km section of the M25 motorway was one tenth that needed by a manual method. (TRRL)

  • Corporate Authors:

    IPC Building and Contract Journals Limited

    Surrey House, 1 Throwley Way
    Sutton, Surrey SM1 4QQ,   England 
  • Authors:
    • HOOD, R A
  • Publication Date: 1980-2-14

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 12
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00319623
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jan 19 1981 12:00AM