Paving at the south Medford interchange project has closed one southbound lane of Interstate 5.

Paving at the south Medford interchange project has closed one southbound lane of Interstate 5.

Southbound freeway traffic will be reduced to a single lane through this evening between Barnett Road and the new interchange. Congestion is expected.

Crews are paving a new southbound off-ramp, Oregon Department of Transportation said.