As subcontractor to architectural/engineering firms, VDA provides consulting services for transportation projects including new construction, upgrades and expansions involving international airport redevelopment and terminals, airport access facilities, bus terminals, rail switching stations and urban terminals, suburban commuter rail centers, parking garages, subways, bridges, and tunnels. The company also consults on observation towers, including one at Niagara Falls. Currently VDA is working on 42 transit projects.