Appointment of Safety Consultants for Four Laning of Rajauli- Bakhtiyarpur section on NH 31(New NH -20) from km 54.405 to Km 101.630(Pkg - II) and from km 101.630 to km 152.520 (Pkg- III) on Hybrid Annuity Mode in the state of Bihar (3rd call) (投標 №73291731cn)