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J. Haberl, J. Litzka:
"Near- field noise emissions on Austrian road surface courses";
Talk: Euronoise 2006, Tampere, Finnland; 2006-05-30 - 2006-06-01; in: "Proceedings Euronoise 2006", Acoustic Society of Finland, (2006).

Supported by the Austrian Federal Ministry of Traffic, Innovation and Technology (BMVIT) an Austrian research project examined different road sections of the Austrian high-level road system with different road surface types of different ages concerning their rolling noise emissions. The analysis of the data showed a clear tendency: the investigated specially optimized noise-reducing surface courses LDDH 8 (Noise-reducing Thin Layer) and LSMA 8 (Noise-reducing Stone Mastic Asphalt) exhibit up to 3 dB(A) lower rolling noise emissions in comparison with their standard counterparts. The results of the examined Porous Asphalt layers (PA 11) lie around further 2 dB(A) lower and show a noise reduction potential up to 5 dB(A) in comparison with the reference surface layer AB 11 (Asphalt Concrete). The investigation of the long-term noise emission behaviour is pointing out the big advantage of Porous Asphalt layers (PA 11) in the first years of their lifetime. But after a period of around 5 years their noise emission performance is in the same range as the other investigated surface courses. In contrast to this the two noise-reducing surface courses LDDH 8 and LSMA 8 could be found in the quietest range over their whole lifetime.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06585612