The U.S. Department of Transportation’s inspector general announced Tuesday that he has ordered an audit of the Metropolitan Washington Airports Authority’s management of the more than $6 billion Dulles Rail Project. The audit, requested by Reps. Frank Wolf (R-Va.) and Tom Latham (R-Iowa), will also review the agency’s overall management of the District’s two major airports and miles of freeway.

“There’s a lot of money involved,” Wolf said. “I want to make sure it’s done appropriately — we don’t want another Big Dig,” he said, referring to Boston’s 3.5-mile tunnel that became infamous for mismanagement and billions of dollars in cost overruns.