Repairing damage to the background, road surface and traffic safety system: Km350+850 - Km354+530, Km368+190 - Km368+524, Km375+035 - Km379+370, Km387+200 - Km390+800, Km392+00 - Km396+800, Km397+250 - Km398+200; Repairing expansion slots: commands Km326+762 and shallow km365+656, QL6, Son La province and Dien Bien province