Bridge Weigh-In-Motion

What’s B-WIM?

B-WIM (Bridge-Weigh-In-Motion) is a technology that utilizes the dynamic strain of the instrumented bridge in order to measure the weight of a travelling vehicle.

systemImage Vietnamese version document


Importance of grasping traffic load

In efficient maintenance of bridges and roads, not only traffic, it is extremely important to understand the characteristics of the traffic load.
Knowing weight and number of passing vehicles helps grasp information of damage to the road structure.

In B-WIM, it is possible to measure the weight of the vehicles traveling on a bridge in real time by using the bridge as weighing scale.

Mechanism of B-WIM

  • Three instrumented strain gauges per lane
  • Strain gauge is installed at girder or deck bottom (Installation on pavement is not needed)
  • Calibration is implemented by using a passing vehicle with known weight

B-WIM mechanism

Implementation Flow

We offer “One-stop solution” from implementation plan to analysis results

Features of TTES B-WIM

  • Proposals on sensor arrangement and processing method based on past experience
  • Algorithm repeatedly improved by actual bridge data processing
    ‐Vehicle detection
    ‐Noise processing
    ‐Eliminating the influence of adjacent lanes
    ‐Correction according to transverse travel position
  • High-speed processing
  • Real-time computing system
  • Flexibly customized to suit demand


Applicable Conditions

Bridge condition
Applicable: Steel-girder bridge (including steel deck)
Requires consideration: RC T girder, PC bridges → depends on stiffness

Suitable conditions
Vehicle speed is constant
There is no lane change
Simple girder (possibly depending on the waveform in continuous girder)

Not applicable
Congested section ※ However, traffic jam can be detected

Application period
One week of continuous data with no holidays and events is recommended