NH-922 Bhojpur–Buxar: A Corridor Where One Defect Explains Half the Findings

Baseline AI-based condition monitoring across 47.9 km of EPC highway in Bihar, Km 27.37 to Km 75.00

This is a project-level account from RoadVision AI's road survey programme for the Patna region, covering the Bhojpur to Buxar section of NH-84, renumbered NH-922, in Bihar. It sets out why a structure-heavy EPC corridor like this one needs continuous monitoring, what the first full survey found, and what a focused follow-up check of one priority segment showed soon after.

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1. A Corridor Built Around Its Structures

The Bhojpur to Buxar section of NH-84, now NH-922, runs 47.9 km through Bihar, from Km 27.37 to Km 75.00, delivered on an EPC basis by the PNC-SPSCPL joint venture. The corridor is not a simple stretch of pavement: it carries 1 major bridge, 6 minor bridges, 6 vehicular underpasses, 9 pedestrian underpasses, 77 culverts (53 slab or box, 24 pipe), and 32 junctions, 10 of them major.

A corridor built around this many structures needs a survey that treats pavement, markings, medians and structure-adjacent defects as one connected picture, not a series of separate inspections. That is the brief RoadVision AI's weekly survey programme for the Patna Regional Office is built to meet.

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2. The Corridor on the Map

The Patna RO's GIS view covers NH-922 alongside the other roads surveyed under the same regional office, with the corridor's path visible through Koilwar and toward Arrah. Figure 1 shows this wider view; the inspection point illustrated here is drawn from the neighbouring Patna Ring Road Package-I project surveyed under the same account, shown to illustrate the chainage-level inspection format used consistently across the region, including on the Bhojpur–Buxar corridor itself.

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3. What the Baseline Survey Found

Survey 1, the corridor's baseline pass, covered the full 47.21 km in 459 segments at a 100 m chainage interval and logged 955 findings across 20 defect types. Of these, 466 (48.8%) were graded High severity, 278 (29.1%) Medium, and 211 (22.1%) Low a markedly elevated High-severity share for a first survey. Faded pavement marking alone accounts for 445 findings, 46.6% of the total, with cracking (176, 18.4%) and missing or irregularly spaced median plantation (153, 16.0%) the next largest categories.

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4. A Closer Look: Re-Checking a Priority Segment

Shortly after the baseline, Survey 2 returned to a 6.30 km segment of the corridor for a focused re-check, covering 63 segments and logging 117 findings across 14 defect types. The pattern held: 58 findings (49.6%) were High severity, and faded pavement marking again led the count at 55 findings (47.0%)  both figures closely tracking the baseline's corridor-wide averages, suggesting the segment chosen for closer attention is representative of the corridor as a whole rather than an outlier in either direction.

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5. From Findings to Action

The contractor,, remains responsible for the corridor's upkeep under its EPC agreement. Each survey report gives the Patna RO and PIU a defect ID, chainage and segment reference sufficient to raise a corrective action request, and a subsequent survey of the same stretch confirms whether that action has actually closed the finding out.

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Our Commitment

RoadVision AI is committed to continuous AI-based monitoring of the Bhojpur–Buxar corridor, and to supporting the EPC contractor accountability that this monitoring enables. A highway built around this many bridges, underpasses and culverts carries a correspondingly high duty of care. Making sure its condition, especially the markings and structures that keep it safe, is verified survey after survey is central to that responsibility.

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