Here are some links to other noise related sites that you may find useful.
Acoustic classification and conformity checking of road surfaces BESTUFS II Converting the UK traffic noise index to EU Noise indices for Noise Mapping Directive 2002/49/EC of the European Parliament and of the Council Environmental Noise Burden of Disease (WHO) Environmental Noise (Scotland) Regulations 2006 (IS/2006/465) Environmental Noise Directive 2002/49/EC (END) Europe Environmental Noise European Environmental Noise Research Future Noise Policy European Commission Green Paper – Brussels 1996 GIPSYNOISE GOAL HYENA IMAGINE Monitoring and Mapping of Environmental Noise Night-time Noise Guidelines (WHO) QCITY Rail and Wheel roughness – implications for noise mapping based on the Calculation of Railway Noise Procedure RANCH ROTRANOMO Scottish Transport Statistics No 22 – 2003 Edition SEPA SILENCE SILVIA Smile Europe Noise Guidelines SMILE see in particular SMILE guidance on road traffic noise abatement SOURDINE II X-Noise