Seattle voters passed a referendum Tuesday for a $2 billion tunnel project downtown, ending a decade of controversy. The Highway 99 tunnel is part of the $3.1 billion replacement of the double-decker Alaska Way Viaduct along the city’s waterfront. The viaduct is considered highly vulnerable to an earthquake.

Mayor Mike McGinn had opposed the tunnel, but around 60% of voters disagreed with him. Gov. Chris Gregoire supported the tunnel.

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