Bengaluru: Long before Bengaluru’s proposed tunnel road became a political talking point, it had already drawn scrutiny on a more fundamental front — its very design.

An expert committee, constituted by the state government, had found that only “bare minimum” geological investigations were carried out for the 16.74 km underground corridor between Central Silk Board and Hebbal, warning that such shortcuts could spell trouble once excavations begin.

While the tunnel road, a proposed signal-free link between two key junctions, is touted as a long-term fix for Bengaluru’s traffic woes, it has drawn criticism over its feasibility, environmental impact and inadequate geological assessment.

As per the current plan, which received government’s approval in June this year, the Bengaluru Smart Inf

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