Plan for selecting contractors for repairing projects and road surfaces and handling risk points of traffic safety, small curves at km321+400-km322+800; Km323+250-Km329+00; Km331+250-Km331+350; Km336+850-Km336+950; Km337+050-Km337+150 and additional rescue line Km45+100- km45+300 QL.279, Bac Kan province