The road will be closed so crews can place concrete barriers along the area where boulders smashed into the retaining fence. The barriers are a safety measure, protecting work crews from traffic during fence repair work.

Drivers are advised to plan for an alternative route during tonight's road closure.

The state Department of Transportation said plans now call for a temporary protective fence and barrier to be built in the next two weeks, which will allow the highway to be reopened to two lanes of traffic, one in each direction.