Here's what you need to know about the Highway 99 closure

Traffic at left heads north on the soon-to-be-demolished viaduct, shot at dusk from Victor Steinbrueck Park in Seattle last month.  The viaduct will be shut down permanently Friday and the tunnel’s big opening party is Feb. 2-3. After the tunnel opens to traffic, the viaduct will be demolished. (Ellen M. Banner / The Seattle Times)
Traffic at left heads north on the soon-to-be-demolished viaduct, shot at dusk from Victor Steinbrueck Park in Seattle last month. The viaduct will be shut down permanently Friday and the tunnel's big opening party is Feb. 2-3. After the tunnel opens to traffic, the viaduct will be demolished. (Ellen M. Banner / The Seattle Times)

Transportation agencies here are deploying a few tools to help keep people moving. Still, the region can't absorb the viaduct's 90,000 daily vehicle trips and 30,000 detoured bus riders without traffic jams that likely will ripple out as far as Woodinville or Auburn.

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