Following the tragic ceiling collapse in the Interstate 90 Connector Tunnel in Boston, Massachusetts, on July 10, 2006, the National Transportation Safety Board’s Highway Accident Report, NTSB Number HAR-07/02, identified several safety issues including, “inadequate regulatory requirements for tunnel inspections.” On July 6, 2012, President Obama signed the Moving Ahead for Progress in the 21st Century Act (MAP-21), which required the Secretary to establish national standards for tunnel inspections. Thus, the impetus for a tunnel safety inspection program can be traced back nearly ten years, with the requirement to develop national tunnel inspection standards mandated nearly four years ago. …
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