I know that after all the bonds are paid off, the total cost for the Big Dig will be $22 billion. I think they should have done that one via a partially-toll-funded public-private partnership, mostly w/companies outside of Massachusetts to avoid the shoddy workmanship. If everybody in the Boston metro wants to clog up and congregate in downtown at once, why not make sure they pay directly for the privilege?
The old Distressway (I-93) was a classic example of “free” urban infrastructure’s version of the Tragedy of the Commons.
And the new I-93 “free” tunnel northbound is a POS that only allows a 35mph speed limit beginning at the southern entrance, going to 45mph further north.