The Gate and the Weighbridge: Where Indian Factories Lose Material
Most material loss in an Indian factory does not walk out in a pocket — it drives out on a truck. The leak sits at three points: the gate, the weighbridge platform, and the scrap yard. At ₹37,500 a tonne for end-cutting scrap, a half-percent short weighment on 500 tonnes a month is ₹11 lakh a year.
If you run a 200–1000 worker plant in Ludhiana, Rajkot, Coimbatore, Bhiwadi or Aurangabad, you already have cameras somewhere. The question is whether any of them is pointed at a truck at the exact second the weight is captured — and whether anyone ever compares that frame against the slip.
Key points
- The scrap account is the biggest unaudited number in most plants. Domestic end-cutting scrap at Mandi Gobindgarh was quoted at ₹37,200–₹38,000/MT in the February 2026 update of Tata nexarc's rate tracker (indicative, ex-GST and freight) — so an 18-tonne shortfall is roughly ₹6.8 lakh of value.
- Weighbridge manipulation is documented, not theoretical. In the PGVCL scrap case in Gujarat, CCTV from three weighbridges showed a man getting off the truck and manipulating the platform with a jack to reduce the reading; 60,892 kg was loaded, 42,650 kg was accounted for, and the reported loss was about ₹41.68 lakh.
- Software-side fraud leaves no visual trace. In the Nagpur "Samruddhi steel" case, police allege a suspect used a digital device to tamper with weighbridge software so the display held steady while 8–10 tonnes came off each trailer. A camera would not have caught the number — only the unscheduled stop.
- Your weighbridge has a legal expiry date. Weighbridges are verified and stamped once every 12 months under Rule 27 of the Legal Metrology (General) Rules, 2011, with re-verification after repair, relocation or a hardware/software change.
- Scrap sales are now a tax-visible transaction. Since 10 October 2024, a registered buyer of metal scrap under Chapters 72–81 must deduct 2% GST TDS where the taxable value of the supply exceeds ₹2,50,000 — so the paper trail on your scrap gate is tighter than it was, and mismatches surface faster.
- The gate is a document checkpoint, not just a barrier. Under the e-way bill rules, Part B carries the vehicle number and validity runs one day per 200 km — so a plate on camera that does not match the plate on the bill is a real, checkable exception.
- Footage only becomes evidence with paperwork. CCTV offered in an Indian court needs the certificate under Section 63 of the Bharatiya Sakshya Adhiniyam, 2023, which replaced the old Section 65B route from 1 July 2024.
Five ways material actually leaves, ranked by how much they cost you
Owners tend to imagine one thief. In practice the losses stack:
- Short weighment on outbound scrap. Tare inflated, platform partly off, axle hanging, a jack under the deck. You sell 18 tonnes and get paid for 14.
- Ghost trips. One physical truck movement recorded as two, or a gate pass issued against a vehicle that never entered.
- Substitution. Prime offcuts leave under an HMS-grade description. The weight is honest; the grade is not.
- Tanker and bulk short delivery on the inbound side. Furnace oil, chemicals, resin — you pay for a full tanker and receive less, and nobody re-weighs.
- After-hours vehicle movement. The tempo that comes at 11:40 pm on a Sunday when the weighbridge operator is "on break".
Categories 1, 2 and 5 are visible to cameras. Category 3 is only partly visible. Category 4 needs weight, not sight.
Where to put the cameras — gate, bridge, yard
Four to seven cameras cover this entire problem in a mid-size plant. This is a different placement problem from the production area; see where to place cameras on the shop floor for that side.
| Position | Camera type | What it must capture | Why it matters in India |
|---|---|---|---|
| Main gate, inbound lane | ANPR/LPR, larger sensor, IR, mounted around 1.2–1.5 m high, angled under ~30° to the plate | Full number plate, front of cab, driver | Plate must be matched against e-way bill Part B and the gate pass |
| Weighbridge, overhead / gantry | Fixed 4MP, top-down over deck | Full load bed at the instant of weight capture | This is the only frame that proves what was on the truck |
| Weighbridge, side elevation | Fixed 4MP, WDR | All axles on deck, nobody standing on platform, no jack under deck | Directly catches the PGVCL-style trick |
| Weighbridge cabin | Fixed, low-light | Operator screen area and cabin door | Catches manual override and after-hours entry |
| Scrap yard / loading bay | PTZ or two fixed 4MP with IR | Loading activity, heap level, tempo/tractor movement | Scrap loading in most plants happens at dusk with no supervisor present |
| Exit lane / barrier | ANPR + overview | Departing plate, loaded vs empty bed | Ghost-trip detection needs both directions |
Two hard constraints in an Indian yard: dust and glare. A gate camera facing an open compound at 3 pm in Rajkot will be blown out without true WDR, and an ANPR camera without proper IR will lose the plate at night. Budget the PoE runs realistically — outdoor cable to the gate is usually the longest run in the plant, and the first thing an installer under-quotes.
The one control that actually works: reconciling video against the slip
Cameras alone change nothing. The control is a three-way match, done daily, on a sample:
- Weighbridge slip — ticket number, gross, tare, net, timestamp.
- Video at that timestamp — top-down frame of the load, side frame showing all axles down and platform clear.
- Document — e-way bill / delivery challan / scrap sale invoice, with the plate number.
Any two of the three agreeing and the third disagreeing is your exception. In practice you want the exception generated automatically: same plate weighed twice within 20 minutes; a weighment with a person visible on the deck; net weight more than X% off the standard for that material and vehicle; a slip with no corresponding video at all.
That last one is the highest-value check and the one nobody runs. A weighment ticket with no video is either a camera failure or a fabricated transaction, and both need answering the same day.
Scrap: set a rate, a schedule and a witness
Scrap is where the money is, and it is usually managed by one trusted person with no second signature. Three cheap rules, before any technology:
- Fixed weighing window. Scrap goes out only between, say, 10:00 and 16:00 on named days. Anything outside that window needs written approval. This alone makes the camera rule trivial to enforce.
- Two-party weighment. The weighbridge operator and one person from accounts or stores present at gross and tare. Not the same pair every week.
- Benchmark the rate. Track your realised ₹/tonne against a public index. If your plant realises ₹32,000/MT while the Mandi Gobindgarh trackers sit near ₹37,000–38,000/MT, the gap is either grade mix, freight and GST treatment, or leakage — and you should know which.
The October 2024 GST changes also pulled metal scrap bought from unregistered suppliers into reverse charge, alongside the TDS rule above. Buyers who used to take your scrap on a kachcha slip increasingly cannot. Use that: insist on registered buyers, and the transaction becomes reconcilable.
What cameras at the gate do NOT do
This is where most vendor material stops being honest.
- They cannot see inside a closed tanker. Short delivery of furnace oil or chemicals is a metrology problem — dip measurement, flow meters, seal integrity. A camera can prove the seal was intact on arrival and who broke it. It cannot tell you the volume.
- They cannot detect load-cell or software tampering. The Nagpur case worked because the display lied. Video of a normal-looking weighment is consistent with a rigged number. Your defence there is the annual Legal Metrology stamping, sealed junction boxes, and comparing weighbridge output against a second scale on a sample basis.
- ANPR fails more than the brochure says. Mud, bent plates, non-standard fonts, bikes and tractors — real-world capture in an Indian yard is good, not perfect. Treat a missed read as an exception to review, not a system failure, and never build an automatic barrier policy that a driver can defeat by smearing a plate.
- They do not solve collusion by themselves. If the security guard, the weighbridge operator and the buyer's driver are aligned, the footage exists but nobody reviews it. The camera only helps if someone outside that circle sees the exceptions — which is the entire argument for automated alerting rather than stored recordings.
- They will not survive a dispute without paperwork. Under Section 63 of the Bharatiya Sakshya Adhiniyam, 2023, an export of footage needs a signed certificate identifying the record, describing how it was produced and giving device particulars. Decide now who in your plant can sign that.
Compliance: what applies in 2026
Two changes matter and are frequently got wrong:
- The Factories Act, 1948 no longer governs. It has been subsumed into the Occupational Safety, Health and Working Conditions Code, 2020, which — with the other labour codes — came into force on 21 November 2025, and the OSH (Central) Rules, 2026 now operationalise it. Anyone quoting Factories Act sections at you about camera policy is working from an old file.
- DPDP applies to your gate footage. Drivers, transporters and contractor staff are data principals. The DPDP Rules were notified on 13 November 2025 and effective from 14 November 2025, with the substantive duties — notice, retention, security, breach reporting — enforced from 14 May 2027. Put up a notice at the gate in the local language, fix a retention period, and log who exports clips. See DPDP and worker CCTV.
The distinction from the people-side problem matters. Tools, spares and finished goods leaving in bags is covered in employee theft and factory cameras. This article is about vehicles and tonnage — different cameras, different controls, and usually a much larger number.
For what the full system costs, see what a factory camera AI system costs in India.
FAQ
Where exactly should I mount the camera on a weighbridge? Two minimum: one overhead on a gantry looking straight down at the load bed, one at platform level from the side showing all axles and the space beneath the deck. The top view proves what was on the truck; the side view proves the weighment was clean. Add a third on the operator cabin.
Can CCTV prove weighbridge fraud in court in India? Weighbridge footage has been central evidence in real cases — it was what exposed the jack trick in the PGVCL scrap matter in Gujarat. But admissibility depends on the paperwork: a certificate under Section 63 of the Bharatiya Sakshya Adhiniyam, 2023, describing the device and how the record was produced. Export the footage with hash values and keep the original intact.
How often must a factory weighbridge be verified? Broadly once every 12 months under Rule 27 of the Legal Metrology (General) Rules, 2011, plus re-verification after any repair, relocation or software modification. Running an unverified or expired-stamp weighbridge is itself a problem under the Legal Metrology Act, 2009 — check your stamp date before you audit anything else.
Will ANPR at the gate catch e-way bill mismatches automatically? Only if you connect them. ANPR gives you a plate and a timestamp; the mismatch check requires comparing that plate against Part B of the e-way bill for that consignment. Most plants do this manually on a sample. Doing it on every movement is a software integration, not a camera feature.
Do I need cameras for tanker deliveries? Cameras are worth it for seal integrity, arrival/departure timing and who accessed the valve — not for volume. Volume needs dip readings or a flow meter. Be sceptical of anyone selling video analytics as a solution to liquid short delivery.
How many cameras does the gate and weighbridge area need? For a typical 200–1000 worker plant, four to seven: inbound ANPR, exit ANPR, weighbridge overhead, weighbridge side, cabin, and one or two on the scrap yard. That is separate from shop-floor coverage, which is budgeted on its own.
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