The article deals with changes in the noise insulation regulations made effective from mid November 1975. The new regulations have placed greater emphasis on noise prediction as opposed to measurement, and permit the use of the most practical alternative specification. The main changes in the regulations are that before insulating a property it must satisfy the condition that a reduction of at least 1.0db(a) would occur if the 'new' road noise were switched off and the received noise from the 'new' highway must not be more than 6db(a) lower than all other received noises combined. The new regulations also make allowances for speed/flow relationships, grooved road surfaces, and the length of the noise source. The fundamental change in the calculation method is the segmenting of a road so that the contribution of noise from every different section of the road can be established. Special allowances are made for carriageway separation greater than 5M and overall crossfalls of at least 1.0M. Properties subjected to substantial noise increase resulting from traffic management schemes where no road works are involved are still not included in the regulations. /TRRL/

  • Corporate Authors:

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 
  • Authors:
    • BARRY, D L
  • Publication Date: 1975-10-17

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00133651
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Aug 23 1976 12:00AM