A stretch of road that connects three of Bihar's key towns is about to get a major makeover. Union Parliamentary Affairs Minister Kiren Rijiju announced on Wednesday, August 19, 2026 that the Union Cabinet has approved the four-laning of the Muzaffarpur–Sitamarhi–Sonbarsa section of NH-22 in Bihar, at a total capital cost of ₹3,590.73 crore under the Hybrid Annuity Mode (HAM).

What the ₹3,590.73 crore approval actually means

The Cabinet decision upgrades a nationally significant corridor that links Muzaffarpur — one of Bihar's largest commercial hubs — northward through Sitamarhi to Sonbarsa, near the Nepal border. Four-laning this stretch addresses a long-standing bottleneck on a route that carries heavy freight and passenger traffic between the Gangetic plains and the Himalayan foothills. The approved capital cost of ₹3,590.73 crore covers construction under HAM, a public-private partnership model where the government pays annuities to the developer after project completion, reducing upfront financial burden on the private partner.

Why HAM — and why it matters for Bihar

HAM has become the central government's preferred instrument for highway projects in states where land acquisition and revenue recovery remain uncertain. Under this model, the private contractor bears construction risk while the government guarantees phased annuity payments — making it easier to attract bidders for stretches that might not generate enough toll revenue on their own. Bihar has received multiple such approvals since 2014, as part of the broader Bharatmala Pariyojana — the flagship national highway expansion programme approved in 2015 — which has systematically targeted state corridors feeding into the national network.

Bihar's infrastructure push and what comes next

This approval fits a pattern of successive central cabinet decisions channelling road investment into eastern India. The Muzaffarpur–Sitamarhi–Sonbarsa corridor, once four-laned, would sharpen connectivity between Bihar's agricultural heartland and border trade points. The immediate milestones to watch are project tendering timelines and land acquisition progress — two variables that have historically determined whether HAM approvals translate into ground-breaking at pace. Any linked announcements on adjacent NH-22 stretches in subsequent cabinet meetings could signal a wider corridor upgrade in the offing.

For a state that has long argued its infrastructure deficit holds back economic growth, this Cabinet clearance is a concrete step — but the real test begins the moment contractors move in.