Abstract
Urban areas of Beirut suffer severe traffic congestion because of a deficient transportation system resulting in economic losses and adverse environmental impacts. Grade separations are proposed at several intersections to minimize this problem. Noise levels, which highly depend on the geometric configuration of an intersection, are a major environmental concern. This paper presents a noise impact assessment at a typical intersection where a grade separation is proposed. For this purpose, field measurements were conducted to define current noise exposure levels and calibrate a noise emission model. Simulations were performed for several scenarios including with and without grade separations, changes in vehicle mix, type of pavement used and level-of-service. The assessment of the impact significance of noise emissions was then conducted by comparing the predicted noise exposure levels with baseline noise levels and relevant noise exposure standards with the objective of optimizing the intersection management in terms of minimal noise impacts.
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