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The goals of this $56-million project in the heart of San Rafael were to elevate and widen the northbound and southbound Highway 101 lanes for the addition of HOV (high occupancy vehicle) lanes and to construct a new southbound 101/eastbound Interstate 580 connector. Related Links: Best of California 2009 One of the more innovative aspects of the project’s design was the use of both lightweight aggregates and EPS block (expanded polystyrene). The project is located immediately adjacent to the San Francisco Bay, so much of the native material underneath the site is what is referred to as “bay mud.” This