NHAI mandates proof checks of complex designs The National Highways Authority of India (NHAI) has mandated independent proof-checking of the designs and drawings by empanelled Indian Institutes of Technology (IITs), government technical institutions and reputed firms, seeking to strengthen safety checks for bridges, viaducts, tunnels and other complex structures in a new policy decision that will come into force from December 1. Published on: Oct 13, 2026, 07:53:40 IST By HT Correspondent, New Delhi Prefer HTon Google Share via Copy link