CRTN

The document was produced by the Department of the Environment and the Welsh Office in 1988 and provides the method of calculating (and measuring) road traffic noise levels for new and altered highways. The document is referred to as the method of assessment to be used in the Noise Insulation Regulations. However, the document is also used for carrying out road traffic noise assessments for planning purposes in relation to Design Manual for Roads and Bridges as well as developments such as housing sites adjacent to existing and proposed roads.

The prediction method calculates the source noise from road traffic by taking in to account the traffic volume, percentage of heavy vehicles, speed, gradient and road surface type.  The screening effects of any barriers, buildings and ground contours are assessed along with distance attenuation.  Finally any reflection effects are considered, and the combined noise level at a given point is calculated for all the roads affecting the receptor.

Contact Your Nearest Regional Office


If you would like to discuss our services get in touch with one of our regional offices directly, which are listed below, or email us at 
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Manchester 

Hepworth Acoustics Ltd (Head Office)
21 Little Peter Street
Manchester
M15 4PS

 

Tel: 0161 242 7900
Fax: 0161 235 8407

Contact Manchester

Birmingham

Hepworth Acoustics Ltd
1310 Solihull Parkway
Birmingham Business Park
Birmingham
B37 7YB

Tel: 0121 635 5565
Fax: 0161 235 8407

London

Hepworth Acoustics Ltd
Hamilton House
Mabledon Place
London
WC1H 9BB
 

Tel: 0207 554 8712
Fax: 0161 235 8407

Liverpool

Hepworth Acoustics Ltd
Bulloch House
10, Rumford Place
Liverpool
L3 9DG
 

Tel: 0151 515 0741
Fax: 0161 235 8407

Contact Liverpool

Sheffield

Hepworth Acoustics Ltd
The Innovation Centre
217 Portobello
Sheffield
S1 4DP
 

Tel: 0114 224 2428
Fax: 0161 235 8407

Bristol

Hepworth Acoustics Ltd
1st Floor, Aztec Centre
Aztec West
Almondsbury
Bristol
BS32 4TD

Tel: 01454 203533
Fax: 0161 235 8407