摘要:Transportation systems comprise one of the main pylons of economic and social development in urban areas, while motorized transportation has historically played the key role in this context. In addition to the positive effects of motorized transportation, a series of negative externalities arises including congestion, delays, pollutant emissions and traffic noise. The purpose of this paper is to examine traffic noise, a major externality in urban centers, both as an environmental problem and a transportation planning challenge. Specifically, an investigation of the correlation of traffic noise with the traffic characteristics of an urban area is carried out through a diachronic observation. Towards this aim, a case study was conducted along selected road axes of the categorized urban network of Thessaloniki's central business district in Greece, where noise levels along the road axes are associated with traffic and urban characteristics of the surrounding area over a seven-year period. Findings concerning the correlation between traffic noise, the existing traffic characteristics and the permanence of the phenomenon are given and possible measures and solutions to deal with the problem are proposed.