Abstract
This chapter aims at finding the optimal shapes of the sound-insulating wall for auto highways. A 2D model of the wall and the auto-highway is considered in which a sound-insulating wall stands perpendicularly to the infinite horizontal plane of the ground and a point source of noise is located at the central point on the road. A cellular automaton is applied together with the boundary element method for this purpose, to find the optimal shapes of the sound insulating wall under several important situations. It is also demonstrated that an optimal shape of the wall, which drastically reduces noise can be found if it is assumed that the cells change even in the diagonal directions.
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