Repair damage to the foundation, road surface, drainage system, shoulder reinforcement and traffic safety system in sections Km176+550 - Km181+000; Km210+500 - Km211+700; Repair and reinforce the lower part of Khe Su bridge Km210+600; Repair expansion joints of bridges: Khe Vang bridge Km187+341; Tang Thanh bridge Km190+800; Twin Bridge Km196+572; Van Trai bridge Km197+248; Truong Son bridge Km202+500; Nhon bridge Km232+200; North-South railway overpass Km229+150; Insert bridge Km233+550; Nha La bridge Km235+750; Repair Khe Go bridge Km212+950; Repairing the risk of losing traffic safety at 2 intersections Km137+700, Km231+950, National Highway 48E, Nghe An province