A -57-year-old man with life-threatening injuries was taken to London hospital by air ambulance after a “serious” single-vehicle motorcycle crash Saturday in Port Lambton, police say.Local fire and emergency medical services personnel also around 8:30 p.m. responded to the crash on St. Clair Parkway, police said.The road was closed between West French Line and West Hold Line for several hours for investigation and cleanup, and reopened around 3 a.m. Sunday, police said.Collision wit