Walls and Landscaping Intelligent Traffic Systems Click on the image to see how sound walls, retaining walls and landscaping make good neighbors out of urban freeways .
Sound walls separate roadways from neighborhoods and mitigate noise.
Retaining walls conserve space and help a roadway to stay within property lines. Landscaping creates harmony between a roadway and its surroundings, improving both the experience of the driver, and the quality of life in the area. Sound Design Principles Sound walls are a popular design feature on new urban freeways. Lesley S. Hoffarth MoDOT Project Manager for The New I-64. Copyright 2000 Missouri Department of Transportation .