I39/90 through Janesville at the Highway 26/Milton Avenue interchange may be a bit of a bottleneck Wednesday. The DOT says one southbound lane will be closed until about 10:00 p.m. Wednesday. A 14-foot width restriction will occur within the work zone, and oversize vehicles must use the interchange ramps to bypass the operation. Construction crews plan to complete repairs to the existing southbound Interstate bridge over the highway.