Tolling a dozen “deficient” bridges – the number that’s being bandied about at the Capitol — at 50 cents a trip for all vehicles would raise $210 million a year, before expenses. We could charge trucks a bit more, maybe bring it up to $250 million, but that’s the reasonable limit. These are my calculations and deductions, not based on state sources. And my list of 12 bridges are spread reasonably around the state. Call the list I’m proposing the Deficient Dozen – the highway bridges most likely to see gantries if that compromise plan actually happens.