Repairing the lighting system of Deo Ngang tunnel; Repaint the paint lines Km468+00 - Km481+00, Km563+800 - Km567+240, Km576+00 - Km580+700; Km581+00 - Km581+600, Km587+00 Km587+700, Km588+700 - Km591+600; Repair and supplement signs, guardrails, anti-glare nets in sections Km468+00-Km481+00, Km504+400-Km595+00; Install traffic safety system at intersections Km521+350, Km529+300, Km529+690, Km529+880, Km544+950; Repairing signal light clusters Km526+600, Km526+900, Km553+500; Move signs R.420, R.421, P.130 to the boom, National Highway 1, Ha Tinh province