I'm not aware of many states that find the operation of their state roadways "profitable." For instance, NJ's drivers GSP and Turnpike toll system don't cover their op costs, since it barely covers the debt service.

The average driver in NJ pays a-half penny per mile to drive on non-tolled roads, which the gas tax funds. Drivers on the New Jersey Turnpike and the Garden State Parkway, meanwhile, pay seven cents per mile and four cents per mile, respectively.

The New Jersey Transportation Trust Fund Authority has new-money bonding capacity this fiscal year and next, but by July 2011, the start of fiscal 2012, its entire $895 million annual appropriation will be needed to cover principal and interest payments on the TTFA's nearly $11 billion of existing debt.