Abstract: A noise reduction barrier is formed by connecting together a plurality of prefabricated vertically oriented panel members so configured that a hollow tubular wall is formed between opposed panels. The space between panels is filled with sand or loose earth which provides the mass to make the structure sound retardant. In alternative embodiments, for increased sound absorption, perforated sheet material may be secured to the outer edges of the barrier wall and the interstices filled with rock wool or similar porous material.