D2 Consult-Tunnel boring machines, railroads and infrastructure builders.

Green Roof Proposed-A plan has been submitted to cover a stretch of California highway with a 24-acre park. It would be built on a deck constructed over the below-grade portion of the Hollywood Freeway (US-101).

Renolith-Concrete of the Future-Interesting concept that allows you to use existing soil/materials to build roads. Environmentally friendly.