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So much construction is under way, that keeping up with detours is practically impossible. Keep your eyes on those ubiquitous overhead freeway message signs. In the meantime, we’ll try to list highlights here:

The carpool lane of I-405 northbound, at the I-90 junction, will close for pavement repair for 38 hours, from 9 p.m. Friday to 11 a.m. Sunday.  Congestion on Saturday afternoon could stretch as much as three miles back to Kennydale, unless drivers make other plans, the state Department of Transportation predicts. Meanwhile, multiple lanes of I-405 in Kirkland will close overnight Friday and Saturday for re-striping.

I-5 southbound will close from 11 p.m. Friday to 5 a.m. Saturday for fire-suppression testing under the state convention center in Seattle. The express lanes will be pointing south by 11:30 p.m., so enter those at Northgate or Green Lake to bypass downtown. Cars on the mainline freeway will be diverted at the Stewart Street exit, along Fifth Avenue, to re-enter I-5 at Spring Street.

Mercer Street and its I-5 ramps will close from 11 p.m Friday to 5 a.m. Monday — and then Mercer will reopen as a two-way boulevard. Fairview Avenue North will be constricted to one lane, causing weekday congestion.

The northbound exit from I-5 to North 85th Street is closed this weekend for resurfacing on 85th.

The right northbound lane of First Avenue South in Sodo opened Friday afternoon, with a temporary steel plate, after a sinkhole closed the section near South Massachusetts Street for three days.

The First Avenue South up-ramp to the Spokane Street Viaduct, is set to open at 6 a.m. next Friday (Aug. 31) after a long delay. The ramp will help traffic get from Sodo to the high West Seattle Bridge, instead of crossing the low swing bridge and some BNSF Railway freight tracks west of First. More here from West Seattle Blog.

Single-lane morning closures are planned Aug. 27-31 on Highway 161 in Federal Way, to finish work related to the new “Triangle” ramps at the junction with I-5 and Highway 18.