Domestic Scan 09 05, Best Practices for Roadway Tunnel Design, Construction, Maintenance, Inspection, and Operations, conducted during August and September 2009, is one of the activities initiated to assist in addressing the need for national tunnel standards and a national tunnel inventory.The scan’s focus was inventory criteria used by highway tunnel owners; highway tunnel design and construction standards practiced by state DOTs and other tunnel owners; maintenance and inspection practices; operations, including safety, as related to emergency response capability; and specialized tunnel technologies. The scan also included consideration of fire suppression; traffic management; incident detection and management; and analysis, design, and construction repairs of existing tunnels.