Washington DOT Building a Road our of Geofoam

From KOMO News in Seattle, Washington: http://www.komonews.com/
DOT building a road out of Geofoam.

The product, called Geofoam, will provide the base for the new on-ramp in front of Safeco Field, but at a fraction of the weight. It'll help protect the delicate pipes and shore up the unsettled soil in the area.