Three westbound right lanes will be closed between the Kaahumanu Street overpass and the Waipahu off-ramp starting Saturday night, the state Department of Transportation said. 

The closures will go into effect 8 p.m. through 10 a.m. Sunday for a concrete pour to widen the Pearl City viaduct.

The lane closures will be reduced to two right lanes from 10 a.m. to 2 p.m. and then reduced again to one right lane from 2 p.m. to 6 p.m., officials said.

The right lane on the H-1 will remain open as an exit only lane to the Waimalu/Pearl City off-ramp starting near the Kaahumanu Street overpass. The normal exit lane connecting to the off-ramp will be open for motorists just before the exit.

“Previous adjustments provided some improvement to traffic flow, but we’re confident that allowing the free right lane leading to the Waimalu exit will help to reduce delays,” said Ed Sniffen, Highways Division Deputy Director. “It will help to separate Waimalu and Pearl City-bound traffic earlier and minimize traffic.”