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EUGENE, Ore. (AP) -- A stretch of Highway 20 that was supposed to replace a deadly 10-mile section between Pioneer Mountain and Eddyville has turned into Oregon's most expensive state highway project.

The 5.5-mile stretch through the crest of the Coast Range was supposed to replace 10 miles of highway between Pioneer Mountain and Eddyville that contained sharp turns and tempted drivers to cross double yellow lines to pass.

The Register-Guard reports construction is six years behind schedule with cost overruns of $170 million.

Department of Transportation representatives and the project's original contractor blame problems on unstable earth deep below the surface in some areas that was left by landslides that occurred thousands of years ago.

The state Transportation Department says the new roadway segment is not scheduled to open until 2015.

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