Traffic Lab is a Seattle Times project that digs into the region’s transportation issues to explore the policies and politics that determine how we get around and how billions of dollars in public money are spent.

Capping its busiest summer in years, Washington State Ferries is warning Labor Day weekend passengers to plan for the biggest weekend of travel since 2019.

Around 400,000 people are expected to travel between Thursday, Aug. 28, and Monday, Sept. 1 — about 100,000 more than last year.

Saturday will be the most hectic of the days, with more than 90,000 people anticipated to board a ferry that day. If that prediction is right, it would be the ninth day since 2019 that ridership topped 90,000 — and eight of those days happened this summer, all of them Saturdays.

Beyond the Saturd

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