HARRISBURG — The state auditor general said the Pennsylvania Turnpike Commission has seen its long-term debt more than double since state lawmakers approved legislation requiring the commission to provide infrastructure funding to PennDOT.

Auditor General Jack Wagner said the agency’s debt has ballooned from $2.6 billion to $7.3 billion since Act 44 was passed in 2007. Under Act 44, the commission must supply the state Department of Transportation with $450 million annually to pay for bridge repairs, road work and mass transit. The arrangement expires in 2057.

The agreement allowed the commission to install toll booths on Interstate 80 to raise additional revenue, but the Federal Highway Administration nixed it.