The 143.5-km upgrade will bring Khagaria to Purnia within about two hours.
The project covers towns including Mansi, Bihpur, Naugachia, Kursela and Katihar, with a new 6.73-km bypass at Purnia. About 90% of the land is already available.
NHAI expected to award the work by August 2026, with construction taking about two and a half years under the build–operate–transfer model.
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