Supplementing the traffic safety system from Km0+00 - Km50+00, repairing the expansion slot of Ben Ben Cau Km37+800, painting the road marks of the segments of Km28+800 - Km30+400, Km33+350 - Km34+300, Km40+00 - Km50+00 DT.261 and the fixed stops on the fixed route on the National Roads of 1B, QL.3, QL.37