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 ...

The purpose of this manual is to provide highway and rail transit tunnel owners guidance for establishing procedures and practices for the inspection, documentation, and priority classification of deficiencies for various elements that comprise an existing ...