Repairing the background, road surface Km455+500 - Km455+800 (P), Km457+650 - Km459+870, Km459+930 - Km463+570 (Paragraph through TP.Vinh); Repair of grooves along the segment of Km415+700 - Km415+936 (P), Km429+632 - Km430+100 (P), Km432+170 - Km432+620 (P), Km432+170 - Km432+620 (T), Km434+540 - Km434+670 (T), Km445+508 - Km445+592+59 Km467+00; Additional water collection, lifting the median strip between the segment of Km423+700 - Km425+900; Repairing Beo bridge Km402+315, Khe Quan Km438+520 bridge (right), Le Km441+838 (left) bridge, forbidden bridge Km442+549 (left), pine bridge KM465+030; Testing and evaluating the safety of railway overpasses Km437+581, Le Canal Bridge of Km441+838, Cam Cau Km442+549, Highway 1, Nghe An Province