Major urban roads produce tangible effects both during and after their construction. The community as a whole benefits, and most of the environmental impact is localised. Planning blight and displacement from homes and shops is keenly felt and very localised. Air pollution dissipates fairly rapidly, and noise and visual intrusion is felt over a wider area. The severance effects on the local community are even more entensive, and, like disturbance, the compensation that can be given will often not be seen to be adequate. Traffic noise can be considered in terms of the loudness equivalent index, and this can be predicted for simple situations. Intersections cause substantial disturbances of several kinds, and there are presently no adequate methods for calculating them. Noise levels can be reduced by 10DBA by a 3m barrier but both noise and visual intrusion can be considerably reduced by putting the road into a cutting. The barriers themselves are visually obtrusive. The evaluation of environmental detriments must rest on the explicit identification of the gains and losses and the numbers of people suffering them. Any degree of sophistication may subsequently be applied to estimate these in numeric or monetary terms. Little knowledge is yet available to assess public reaction to the weighting of environmental factors or the different design standards that might be used. The covering abstract is IRRD No. 208123.

  • Corporate Authors:

    Planning and Transport Res and Computation Co, Ltd

    40 Grosvenor Gardens
    London SW1,   England 
  • Authors:
    • Collier, J C
  • Publication Date: 0


  • English

Media Info

  • Features: References;
  • Pagination: 7 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00262600
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper
  • Files: ITRD, TRIS
  • Created Date: Jan 9 1975 12:00AM