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At a meeting in Seattle last week, lawmakers heard that the funding gap for replacing the storm- and seismically-vulnerable, crowded four-lane SR 520 bridge across Lake Washington can be shaved from $2.6 billion to $2.38 billion through a sales tax deferral of $220 million. They also had a look at the current menu of gap-closers. It includes more borrowing against electronic tolling revenues, plus higher toll rates on the 520 bridge, and especially, tolling of the parallel I-90 bridge. As ever, tolling’s a flash point, but it needn’t be ugly. It can equitable, and farsighted. Metro Puget Sound needs a comprehensive regional highway corridor electronic tolling plan, typically with express “HOT” lanes aside free lanes, and higher rates at peak hours.

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The State Route 520 Tolling Implementation Committee’s “November Scenario Evaluation” document released yesterday shows that the most robust regional financing for replacing the dangerously sub-par 520 bridge comes from time-variable tolling on it starting in 2010 and tolling the parallel I-90 span across Lake Washington, starting in 2010 or 2016. Tolling in this key east-west corridor would be done on the fly, electronically, with vehicle windshield transponders and overhead gantries; no toll booths. Tolls that vary by time of day are likely, though flat rates are also an option. Special lanes that would be free to buses and ride-sharers could be made available to solo drivers, for a price. The committee’s members are WSDOT Secretary Paula Hammond (pictured, left), Puget Read More ›