A late-night closure is planned on westbound state Route 18 in Federal Way, according to the state Department of Transportation.
The lanes near Interstate 5 will be closed from 11 p.m. to 4 a.m. Thursday.
Drivers will be directed on a four-mile detour onto northbound I-5 to S. 320th Street, then southbound on I-5 to SR 18.
Crews are installing framework for a future flyover ramp between westbound SR 18 and southbound I-5.
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