Noise protection walls are widely used in The Netherlands. The walls made of plexiglas are semi-transparent and protect people and nature from noise and dirt. Click photo (Highway A12 near Velp, Gelderland, Netherlands) to enlarge:
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Lecturer at university, web/blog designer: Parks and Landscapes, Kaledinova Web Design, Business Crossroads Consultancy. Follow Parks and Landscapes on Twitter: @palblog Paperback and eBook by Elena Kaledinova: "Learn Russian to work with Russians: The Easy Way To Speak Russian" - basic business Russian.