On northbound I-5, lane restrictions will snarl traffic from Federal Way through SeaTac and Tukwila. On the Highway 520 bridge, all eastbound lanes will be closed from 11 p.m. Friday until 5 a.m. Monday.

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Traffic jams return to Southcenter Hill this weekend, as bridge and pavement repairs over the Duwamish River will reduce northbound Interstate 5 to just two lanes.

Lane reductions last from 8 p.m. Friday until 5 a.m. Monday, causing congestion from Federal Way through SeaTac and Tukwila. Delays could also spill onto nearby segments of Highway 518 coming downhill from the airport, and Interstate 405 converging from Renton.

Workers will be replacing worn-out bridge expansion joints and rutted pavement.

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, CenturyLink, Kemper Development Co., NHL Seattle, PEMCO Mutual Insurance Company, Sabey Corp., Seattle Children’s hospital and Ste. Michelle Wine Estates. Seattle Times editors and reporters operate independently of our funders and maintain editorial control over Traffic Lab content.

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This job, the 10th of 11 weekend lane reductions in the Revive I-5 program, was rained out in September. This weekend’s forecast calls for partly sunny skies and no chance of rain.

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The final closure of this year is scheduled for next weekend, Oct. 20-23, followed by work in 2018. The $31 million job is funded by state gasoline taxes.

In other traffic hot spots:

• The eastbound Highway 520 bridge, all the way from I-5 to 84th Ave. Northeast, will close from 11 p.m. Friday until 5 a.m. Monday, while state crews put finishing touches on a bus-carpool extension near Foster Island. High-occupancy vehicles will be able to break out of general traffic one mile sooner, on their way to the Eastside.

• Lane reductions and diversions continue at Interstate 90 deck-repair sites through the Snoqualmie Pass corridor, including the high westbound bridge near the West Summit interchange. The work was supposed to be finished by Labor Day.

• A few rallies and events will affect downtown Seattle. The main event Saturday is a Nationwide Solidarity March for Peace at 11 a.m., from the state ferry terminal to Occidental Park and City Hall. Sunday events include the No Muslim Ban Ever rally and march, set for early afternoon near Westlake Park; a Sounders FC match against Dallas at 4:30 p.m.; and the Arcade Fire concert in KeyArena at 7:30 p.m.

• The southbound I-5 express lanes won’t open Saturday until 10:30 a.m., and at 11 a.m. Sunday, rather than the usual 8 a.m. Workers will clean stormwater drains on the Ship Canal Bridge.