[New aspects of the traffic noise problem in the inner city area].

As a result of a sociological-oriented noise study in the city of Erfurt specific intracity noise problems are analysed via their effects. The authors deal with the expectation of calm of people living in different areas of the city, with the relevance of effect of the two usual evaluation levels Leq and Lmax for noise by running traffic, with noise decrease by sound attenuation improvements, and with the subjective and objective evaluation of an industrial front ventilation element. Moreover, the effects of traffic noise on inhabitants before and after significant traffic reduction are shown.