“Ghost town” is a little strong.
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I agree with another poster that traffic is holiday light.
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Many school districts are shut down temporarily for cleaning and training and will open up next week.
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Here is the link to all the bus service changes in King County:
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https://kingcounty.gov/depts/transportation/metro/alerts-updates/service-advisories.aspx
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Nothing but normal route changes.
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Pike Place is open, usually quiet this time of year......and a lot of rain lately.
Here is another report using similar terms: