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Automated Vehicle Weight Measurement (IoT, Real-Time)

A web system for highway toll stations that integrates three IoT device types — magnetic sensors, weighbridges, and OCR cameras — within 2 seconds to detect, alert on, and control overloaded vehicles in real time. Delivered to three toll stations on a Vietnam northern expressway in 2.5 months.

自動車両重量測定システム（IoT連携リアルタイム検知）
業界 | IndustryTransportation Infrastructure / Highway Operations
主要技術 | Core StackIoT / Multi-threading / OCR SDK / Real-Time
開発期間 | Duration2.5 months
導入実績 | Deployment3 toll stations, Vietnam expressway

課題 Challenge

  • The legacy system couldn't support newer device firmware, blocking any further functional improvements.
  • The original vendor had dissolved — neither source code nor documentation was available.
  • Data from multiple IoT devices had to be integrated and visualized in real time.

主な機能 Key Features

  • Vehicle detection via magnetic loop sensors
  • License-plate recognition via OCR cameras
  • Vehicle weight measurement (data logger integration)
  • Automatic overload detection and warning display
  • Real-time display on roadside E-boards
  • Barrier control for overloaded vehicles
  • Passage history search and export
  • Data center synchronization

技術的課題と解決策 Technical Challenges & Solutions

Real-Time Multi-Device Sync (Sub-2s)

Vehicles pass through every ~5 seconds, so the entire acquire-integrate-display cycle had to complete in under 2 seconds.

Solution

Adopted multi-threaded processing — OCR, weight data, and magnetic-sensor processing run in parallel. Magnetic-sensor triggers serve as unique keys to correlate all streams for fast integration.

Rebuilding Without Documentation

The legacy system shipped only as an installer binary — no source code, no specifications.

Solution

Decompiled the binary to reverse-engineer logic and rebuilt the system from scratch using the OCR vendor's SDK — including licensed device-control modules.

技術スタック Tech Stack

Multi-threaded Processing OCR SDK Magnetic Loop Sensor Data Logger Integration TCP/IP Real-Time Pipeline

開発成果 Results

  • Delivered on schedule in 2.5 months and deployed to 3 toll stations on the Phap Van–Cao Bo expressway in northern Vietnam.
  • Achieved high-precision detection and long-term stable operation — fully resolving customer concerns about IoT integration.
  • Significantly improved overloaded-vehicle detection accuracy, helping protect road infrastructure.
  • Real-time alerts improved road safety and dramatically reduced the manual-monitoring workload.
  • Accumulated passage data now feeds advanced traffic-flow analysis and policy planning.

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