Everybody's paying for the Big Dig

After the federal dollars dried up, the state had to find some other way to pay for the $15 billion dollar project (original cost: $2 billion.) So Massachusetts diverted money from MassPike tolls:

Massachusetts Turnpike commuters have paid $442 million in tolls to cover Big Dig expenses over the past three years, according to a financial analyst hired as part of a class action lawsuit against the Turnpike Authority.
Commuters, politicians, and state officials have long argued that tolls collected on the turnpike have been used to pay off unrelated portions of the $15 billion project, amounting to a back-door tax that unfairly burdens one segment of the public.

It never ends. Can't we fill the damn thing back up with dirt?