The authority now generates about $350 million in annual toll revenues.

The parkway was built with $416.4 million in bonds, to be paid back with toll revenue over 35 years.

Truck traffic makes up almost a third of the turnpike's $350 million in annual toll revenue.

This reduction in toll revenues brought the company to the brink of bankruptcy.

It would allow the state to repay the private investors when toll revenue is building up in early years after opening.

Such a tunnel might well pay for itself from toll revenue without any net cost to the government at all.

Questions that the agencies have stumbled over include: Who will handle the common toll revenue?

As a further enticement, the locals could be allowed to pocket the toll revenues.

Between 1830 and 1832, the canal carried 539,081 tons per year, which generated £40,123 in toll revenue.

The total bill for the repair is expected to exceed one billion dollars, and will be paid through toll revenue.