A four-year, nearly $40 million project to build a bridge and rock-shed tunnel on Highway 1 near Lucia is complete.
Caltrans announced last week that the one-fourth-mile stretch of road near Pitkins Curve in Monterey County is now open to traffic in both directions.
The area, about 20 miles north of the San Luis Obispo-Monterey County line, has been notorious for its washouts.
The new structure is intended to keep falling rocks and slides off the roadway, reducing the chance of a highway closure.
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The project also includes a retaining wall.
According to Caltrans, the rock-shed is the only roadway structure of its kind in the country.