Construction started Wednesday morning on the Harlem Avenue bridge over the Cal-Sag Channel in Palos Heights and Worth, reducing traffic to a single lane.

Traffic will be down to one lane, with flaggers on the bridge every day for the duration of the project, according to the Illinois Department of Transportation. The closure times will exclude peak traffic hours of 7-9 a.m. and 4-6 p.m.

The lane closings are for bridge repair work and painting that’s supposed to be completed over the summer.