More Big Dig mistakes?

Seriously, the Big Dig, and by extension the Turnpike Authority, is just the gift that keeps on giving in the form of news stories. From Bloomberg:

The Massachusetts Turnpike Authority faces the possibility of higher borrowing costs because of derivative agreements it made with UBS AG and Lehman Brothers Holdings Inc. involving $800 million of debt for Boston's `Big Dig' highway project, credit-rating analysts and officials said.

UBS may exercise an option it bought from the authority to start an interest-rate swap on the bonds on Sept. 4. Should Lehman exercise a similar option it purchased, the authority may end up paying variable interest rates on more than a third of its debt, a prospect credit raters said is risky given the agency's pinched finances from cost overruns on the $14.8 billion Big Dig.