Tunneling beneath ecologically sensitive zones like the Southern Aravalli Ridge raises critical questions about balancing development with environmental protection. Discuss the legal and regulatory framework governing such projects in India.

The CCEA's 2026 approval of the 6-lane NH-148AE tunnel — 1.98 km of which burrows beneath Delhi's Southern Ridge — illustrates India's attempt to reconcile urban mobility with ridge conservation through a layered clearance architecture rather than an outright development ban [1].

Statutory framework governing such projects

• Van (Sanrakshan Evam Samvardhan) Adhiniyam, 1980 (renamed by the 2023 amendment) mandates prior Central approval for any non-forest use of forest land; the Ridge, a reserved forest under the Indian Forest Act, 1927, falls squarely within it [2].
• EIA Notification, 2006 requires environmental clearance with public consultation for highway projects above threshold length.
• National Highways Act, 1956 empowers NH declaration and acquisition; surface components attract the LARR Act, 2013 on compensation and rehabilitation.
• Wildlife (Protection) Act, 1972 and CRZ-type siting norms apply where corridors or protected habitats intersect.

Judicial and institutional oversight

• The Supreme Court's M.C. Mehta line of orders on the Aravalli and Delhi Ridge restricts construction and mandates ridge management plans.
• The National Green Tribunal, under the NGT Act, 2010, offers fast-track review of clearances affecting ridge ecology.
• MoRTH–NHAI–GNCTD coordination determines on-ground compliance, since land, traffic and local permissions rest with the state.

Where the balance is struck

• Engineering choice becomes a regulatory instrument: Tunnel Boring Machine twin-tube construction avoids surface felling and cut-and-cover disruption, minimising the forest diversion footprint [1].
• Conditional clearances impose compensatory afforestation, net present value payments and monitoring — shifting the debate from "whether" to "how much" ecological cost is acceptable.
• Weaknesses persist: post-clearance compliance monitoring is thin, and the 2023 Act's project exemptions have narrowed the scope of prior scrutiny [2].

India's framework is thus sound in design but uneven in enforcement. Strengthening third-party compliance audits, cumulative impact assessment for the Aravalli as a single ecosystem, and mandatory least-disturbance technology choices would let corridors like NH-148AE serve mobility while honouring Article 48A and SDG 15 on terrestrial ecosystems.