The result of modernization and rapid progress in human progress leads to a negative aspect -noise pollution. The noise barriers are undeniable factor when we are designing a new road or reconstructing an existing one for improving the performance characteristics of the road. Nowadays, the noise is considered to be an extremely aggressive and widespread form of pollution. For this reason, it affects people, both physically and mentally. It fundamentally violates activities such as communication, sleep, exercise, rest. Of course, the main cause of noise is human activity and the desire to develop progress: the main source is road, rail, water and aircraft transport. The subject of this scientific research will be traffic noise - it arises from road traffic as a result of the interaction between motor vehicles and the road. Acoustic Walls are defined as solid, practical sound-proof precursors, creating a sound shadow zone behind them. The quantitative measure of the noise effect of the wall is its acoustic efficiency. The location of the noise barriers/walls is essential, except for better acoustic efficiency but also for safety. There are no precise principles of where they can be installed in the legal base of the Republic of Bulgaria. This factor led to certain problem with road safety. The current practice in Bulgaria put a pattern in the design and build in noise barriers: they are built extremely closely to the noise source which is directly beside the road lane which has already placed restraining systems (range between 19 and 80cm) which makes them ineffective because it is not the observed the minimal necessary for the deflection of the guard rail.
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