Significant traffic impacts are also expected on routes around the work area.
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As of 6pm, WSDOT advised, "This could take a while to clear. Use alternate routes and expect delays."
The multi-lane roundabout is expected to be equipped with a "curb-separated pedestrian and bicyclist facilities."
The impacted area is located between I-5 and the downtown area in Ferndale.
The road was reportedly being reopened about 11:25am.
WSP: The motorcycle "veered to the soft right shoulder for an unknown reason."
Crews have been clearing the road for the past several weeks.
Crews manning 2 class-C tow trucks have been working for hours to retrieve the truck and trailer.
The semi-truck was reported to have ended up several feet off the road.