Southbound Interstate 405 between Bellevue and Renton will close this weekend, as work continues to add toll and exit-only lanes.

Meanwhile, drivers in Issaquah on westbound Interstate 90 will be funneled into a single lane while crews maintain 55-year-old bridges, causing traffic jams for freight and late-summer road trippers.

Light rail will run normally, while special Sounder trains serve Puyallup fairgoers and Seattle baseball fans.

Here are the highlights:

All southbound lanes of I-405 will close from Coal Creek Parkway (Exit 10) to Sunset Boulevard (Exit 5) between 11:30 p.m. Friday and 4 a.m. Monday.

Rain in the forecast caused some doubt because it would hinder painting crews when they apply new stripes for a shift in lanes.

“The project is a go,” Washington State Department

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