Tolling will begin in the Highway 99 tunnel Saturday, Nov. 9, nine months after it opened.

Rates will vary by time of day, ranging from $1 each direction in overnight hours to $1.50 for the morning commute and $2.25 at the peak afternoon commute.

Traffic Lab is a Seattle Times project that digs into the region’s thorny transportation issues, spotlights promising approaches to easing gridlock, and helps readers find the best ways to get around. It is funded with the help of community sponsors Alaska Airlines, Kemper Development Co., NHL Seattle, PEMCO Mutual Insurance Company and Seattle Children’s hospital. Seattle Times editors and reporters operate independently of our funders and maintain editorial control over Traffic Lab content.

Private transit and registered van pools will ride for free, but carpoolers will pay the toll.

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As Traffic Lab reports on the tolling system, we’d like to know: What questions do you have about tolling the Highway 99 tunnel?