Unmanned Weighbridge System: How RFID, ANPR and Sensors Run the Weighbridge Without an Operator
A weighbridge sits at the one point every truck must pass: the plant gate. Yet at many industrial sites it still runs on manual vehicle identification, operator entries, paper slips and separate systems. That slows dispatch and leaves room for data errors, reconciliation problems and limited visibility.
An unmanned weighbridge system changes this. It combines RFID or FASTag, ANPR cameras, positioning sensors, boom barriers and software so that a vehicle can be identified, guided, weighed and cleared with minimal manual intervention. For mining, cement, steel, manufacturing, logistics, power and bulk material handling, it is a practical part of a wider digital transformation plan.
This guide explains how an unmanned weighbridge works, which technologies sit behind it and how to upgrade a weighbridge you already own. For the wider business case, see our overview of weighbridge automation.
What Is an Unmanned Weighbridge System?
An unmanned weighbridge system is an automated weighing setup in which vehicle identification, positioning, weight capture and record creation are handled by RFID or FASTag, ANPR, sensors and software, with minimal operator involvement. Staff monitor exceptions from a control room instead of recording each weighment by hand.
“Unmanned” here means that no operator is needed for routine weighments. People are still part of the process, but they focus on exceptions, monitoring and decision-making rather than routine data entry.
A typical system uses RFID/FASTag-based vehicle identification, ANPR cameras, digital weight capture, vehicle-positioning sensors, traffic signals, boom barriers, CCTV and computer vision, driver guidance, smart kiosks and voice prompts. It also produces automated records and digital documentation, connects to ERP/WMS systems, and provides dashboards, alerts and analytics. The aim is a controlled and traceable weighing process with minimal manual intervention.
How Does an Unmanned Weighbridge Work? Step by Step
A well-designed system connects the complete vehicle movement cycle, from the moment a truck reaches the gate to the moment it leaves.
1. Vehicle identification
When a truck reaches the gate, RFID, FASTag or ANPR identifies the vehicle and matches it with the registered vehicle or trip information.
2. Entry and authorisation
The system verifies details such as vehicle authorisation, dispatch reference and weighbridge status before allowing entry. Boom barriers and traffic signals control movement automatically.
3. Guided positioning
Sensors, cameras, display boards and voice instructions help the driver position the vehicle correctly on the platform. This reduces mispositioned readings and unnecessary re-weighments.
4. Driver verification
Where required, a smart kiosk with facial recognition can verify the driver and connect the transaction to an identified person.
5. Automatic weight capture
Once the vehicle is correctly positioned and the weight is stable, the system captures gross, tare and net weight electronically, along with the relevant transaction information.
6. Digital documentation
The system can automatically generate digital weighment records and, where configured, support documentation such as challans and e-way bills through automated workflows.
7. ERP update and exit
After validation, the transaction can be transferred to the ERP, logistics or dispatch system. The vehicle then proceeds through the exit process.
The result is one connected flow: Vehicle identification → Authorisation → Weighing → Verification → Documentation → ERP update → Dispatch.
Technologies Used in an Unmanned Weighbridge System
A modern weighbridge management system typically combines several technologies:
|
Technology |
What it does |
|
RFID / FASTag |
Quick and reliable vehicle identification. |
|
ANPR / LPR |
Captures and verifies vehicle registration numbers. |
|
Cameras and computer vision |
Supports vehicle monitoring, identification and visual records. |
|
Sensors |
Help confirm vehicle positioning and weighing conditions. |
|
Weighing indicator / digitizer |
Transfers weight information to the software. |
|
Boom barriers |
Control vehicle entry and exit. |
|
Traffic signals and voice guidance |
Help manage vehicle movement safely. |
|
Smart kiosks |
Provide driver interaction and verification. |
|
IoT controllers |
Connect field devices with the software platform. |
|
Automates repetitive documentation and data-processing activities. |
|
|
Dashboards and alerts |
Provide visibility into transactions, queues and exceptions. |
Can an Existing Weighbridge Be Made Unmanned?
Automation does not always require replacing the existing weighbridge. Depending on its condition and compatibility, existing weighing infrastructure can be connected with additional RFID, cameras, sensors, barriers, controllers and software. The condition and calibration of the weighing platform, and the indicator’s ability to send data to software, are the first things to check.
This lets the investment match the plant’s actual requirements rather than following a one-size-fits-all model.
Site Assessment Checklist for Weighbridge Automation
A site assessment can determine:
- What existing equipment can be reused
- What hardware needs to be added
- How many gates require automation
- Whether traffic is one-way or two-way
- What ERP or WMS integration is required
- Network and infrastructure requirements
- Reporting and compliance requirements
How Softweb Approaches Unmanned Weighbridge Projects
For Softweb Technologies, an unmanned weighbridge is not limited to automating the weighing step. The focus is on connecting the weighbridge with the wider industrial ecosystem. Softweb combines capabilities in ERP, IoT, AI/ML, computer vision, RPA, analytics, logistics and system integration.
- SmartWeigh Automation: automated vehicle identification, positioning, weighing, documentation and transaction control.
- IoT and hardware integration: connecting weighing systems, RFID, cameras, sensors and field devices through our IoT and IIoT solutions.
- AI and computer vision: supporting vehicle identification, monitoring and surveillance use cases.
- Mining and logistics expertise:TransMINEX [1.5] supports weighbridge data logging, dispatch and route-related processes.
- ERP integration: connecting weighment data with PACE360 [1.6] and other enterprise platforms.
- Custom workflows: adapting the solution to the plant’s gate layout, material flow and business rules.
Once vehicles are identified and weighed automatically, the next question is control: how do you stop errors, manipulation and material loss at the gate? Our guide to weighbridge fraud and material loss covers exactly that.
Planning an unmanned weighbridge for your plant? Talk to Softweb’s team about a site assessment.
Frequently Asked Questions About Unmanned Weighbridge Systems
What is an unmanned weighbridge system?
An unmanned weighbridge system is an automated weighing setup in which RFID or FASTag, ANPR, sensors, cameras and software handle vehicle identification, positioning, weight capture and record creation with minimal operator involvement. Staff monitor exceptions and dashboards instead of entering every weighment by hand.
How does an unmanned weighbridge identify a truck?
RFID tags, FASTag or ANPR cameras read the vehicle’s tag or registration number as it reaches the gate. The system matches it with registered vehicle or trip information and checks authorisation and the dispatch reference before the boom barrier allows entry.
Do I need to replace my existing weighbridge?
Not necessarily. Depending on the condition and compatibility of the existing platform and indicator, RFID, cameras, sensors, barriers, controllers and software can be added. A site assessment confirms what can be reused and what must be added.
Which industries use unmanned weighbridges?
Mining, cement, steel, manufacturing, logistics, power and bulk material handling. Any site that moves high volumes of raw materials or finished goods through a gate can benefit.
Can an unmanned weighbridge connect to my ERP?
Yes. After validation, transactions can be transferred to ERP, WMS, logistics or dispatch systems, so vehicle, weight, material and transaction details do not have to be entered again at each stage.
What happens if the system cannot identify a vehicle or detects a problem?
Exceptions such as an unrecognised vehicle, a positioning issue or a missing dispatch reference are flagged through alerts so that a person can review them, rather than the transaction proceeding automatically.
