Based on the simulation program, it is possible to modify as hape of ab uilding façade to obtain favourable conditions of acoustical climate. The favourable conditions are searched for in af orm of ar ecess in ab uilding façade creating avertical niche. Observing the recess parameters and the building position in relation to the road, the range of the total positive effect is defined. The applied simulation program considers ar oad structure and trafficcomposition as well as influence of surrounding objects. Adjusting the modelling accuracy, the simulation model validation range is defined. The comparison with the field measurements showed that the simulation model could be applied for upper floors of the high-rise building. Forthis range, the obtained results can be applied in designing of the noise abatement means. PACS no. 43.50.Lj, 43.50.Rq ACTA ACUSTICA UNITED WITH ACUSTICA Janczur et al.:F açade shaping against traffic noise Vol. 97 (2011)