Heavier than normal traffic is forecast for I-5 through Seattle and I-405 east of Seattle during the shutdown.
Highway 99 will close at 7:30 p.m. on Oct. 21 until 5 a.m. on Oct. 31.
Northbound I-405 in Bellevue, Wash., will close from Northeast Eighth Street to State Route 520.
Truckers will face detours as a section of Interstate 405 in Bellevue, Wash., will shut down April 1-4.
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