Noise emitted from motorized vehicles is one of the major annoying and negative impacts on the environment and the citizens.

Actually, discussions about noise from motorized two wheelers are getting in the focus of various stakeholder from citizens' initiative to politics and future legislative regulations might tighten the already stringent noise limits.

In order to assess the actual status of noise emitted from motorized two wheelers an experimental study was carried out, in which the major noise sources are assessed according to their contribution to the overall level of pass-by noise for several two-wheeler vehicles.

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