This study evaluates sound performance of buildings gap configuration exposed to linear finite length sound source (e.g. traffic noise). As a mean of traffic noise attenuation to prevent sound waves penetration through these gaps to the urban area behind the buildings. A theoretical background of the acoustical performance of buildings that act as a noise barrier between the source (vehicles) and the receiver environment is presented. These barrier buildings interrupt the straight line path from the source to the receiver, and provide a buffer zone that shields and protects sensitive areas from highway traffic noise by locating them in the noise shadow area. Computer simulation of mathematical methods are analyzed as case studies which are applied to test the effect of different type of organization and geometrical design of exposed buildings facades in order to examine the effect of gap depth and its shape on traffic noise penetration of direct and reflected sound waves from the sidewalls surrounding the gap and to examine their impact on noise penetration to the urban area facing traffic noise. The objective of the research is to study the effect of buildings organization (type of grouping) and their geometrical configuration on noise penetration and geometrical spread of direct and reflected sound waves from buildings facade around the gaps (open spaces) between these buildings to the shadow zone in aligned urban area.