Abstract: A sound barrier includes a plurality of vertically extending posts, wherein each post has an I-shaped cross section defined by a central web and spaced apart pairs of flanges that define oppositely disposed channels for receiving the end portions of sound wall sections. At least one wall section may be received within each channel. The wall sections may have a thickness that is less than the width of the respective channel, so that a space or gap is created between the wall section and one of the flanges of the post. At least one bracket is positioned in the space and attached to the wall section to retain the wall section within the channel.