Construction crews are closing the Interstate 90 express lanes in between the morning and evening commutes this week to replace concrete barrier on Mercer Island.

The barrier was removed two weeks ago to allow two lanes of traffic to merge from the I-90 westbound mainline lanes to the I-90 express lanes while the crews replaced the expansion joints on the floating bridge.

During the evening commute and into the evening, traffic will be narrowed to one lane in the I-90 express lanes on the east side of Mercer Island.

The details:

From 9 a.m. to 2 p.m., Monday, July 20 through Friday, July 24: The I-90 express lanes will be completely closed for construction.

From 2 p.m. to 10 p.m., Monday, July 20 through Friday, July 24: The left I-90 express lane will be closed for construction on Mercer Island from Island Crest Way to East Mercer Way when traffic is heading in the eastbound direction.

Drivers can track construction closures at www.wsdot.wa.gov/construction/2009 and can check traffic online before they leave home at www.wsdot.wa.gov/traffic/seattle.