The aim of the project is to build up a subtly differentiated road traffic noise calculation model that can be used for the development of effective and economic noise reduction action plans on a local base as well as for the assessment of noise reduction strategies within the frame of the environmental protection policy in the EU or its member states. To reach that goal the model must include all relevant influencing parameters, be sensitive for all kinds of reduction measure scenarios, and be applicable to future prospects estimations. The model will be capable to consider technical improvements leading to noise emission reduction of vehicles, tyres and road surfaces, traffic management related measures, driving behaviour influencing measures, reduction of the transmission of sound (e.g. improvement of noise barriers), environmental planning, structural changes, cost effects of noise reduction. That means that the sources have to be considered in a much more differentiated way as in existing models or even as in ongoing EU research projects.