The main problem of the operation of motorways in an urban environment is the effects of Road Traffic Noise (RTN) on population. These effects are not limited to issues related to public health, but also extend to other social sectors such as learning difficulties for students and the degradation of the value of areas exposed to high levels of RTN.The main problem of the operation of motorways in an urban environment is the effects of Road Traffic Noise (RTN) on population. These effects are not limited to issues related to public health, but also extend to other social sectors such as learning difficulties for students and the degradation of the value of areas exposed to high levels of RTN.The purpose of the doctoral thesis is to find the best technical solutions to limit the RTN at the source using new materials-technologies, adapted to the Greek conditions, with the simultaneous formation of a technical-economic proposal to change both the limits of the existing legislation and the type of receivers that these concern.The methodology that will be followed in the first stage of the doctoral thesis is that with the use of appropriate tools the limitation of the RTN at the source. Indicatively, with the use of appropriate noise prediction software, various solutions will be studied on a wide scale that have not been studied - applied in Greece.Then there will be a comparison of the results with the situations before and after the implementation using the data resulting from the monitoring programs of RTN.In a second stage and depending on the conclusions that have been drawn from the first stage, the technical-economic analysis of the application of new RTN limits and the extension of anti-noise protection to the entire population and not only to those located within statutory settlement limits will be attempted.