Construction and Upgradation of NH-131A from Km. 34.578 near Narenpur to Km. 81.000 near Purnea to 4 Lane standard in thew State of Bihar on Hybrid Annuity Model under NH(0) Funding (Package II)

A Concessio ID is a 12-character canonical identifier for an infrastructure concession. The format is CC-AA-S-NNNNNN-K — country, asset class, structure, sequence, and a Luhn check digit. The check digit protects against typos and fabricated IDs.

Concessio IDs are stable for the life of the concession. They do not change if the asset is renamed, sold, or restructured. Cite them in filings, press releases, research reports, and contracts.