PennDOT District 11 is announcing a ramp closure on McKnight Road (Route 4003) in the City of Pittsburgh, Allegheny County will begin Monday, September 30 weather permitting. Starting 8 a.m. Monday, the southbound Nelson Run Road ramp to southbound McKnight Road will undergo an around-the-clock closure continuously through mid-October. Crews will conduct concrete patching work on the ramp. Traffic will be detoured.