The governor of Washington state this week signed legislation that will allow the state to replace the aging Alaskan Way Viaduct in Seattle with a $4.2 billion deep-bored tunnel. Gov. Chris Gregoire said the state can afford to build the tunnel and noted that it has a 27% contingency built into the cost. Critics of the project favor replacing the viaduct, which carries 110,000 vehicles per day, with improved transit and surface streets.

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