The Weigh In Motion (WIM) system

How does it work

The Weigh In Motion (WIM) system BISON is composed of 2 stainless steel bending plates equipped with fiber optic sensors connected to a datalogger.

The bending plates are installed flush with the road surface and can be placed on urban and suburban roads, motorways / highways, bridge and toll booths.

The data acquisition unit (datalogger), processes, and stores all information collected in a database. All the transit information is made available to the user through a web interface easily accessible from every device.

iwim bisonte schema sistema 2021

Technical Features

  • Accuracy class: 7%
  • Maximum weight per axle: 20 t
  • Speed range: 5-110 km/h
  • Transit directions: Both
  • Accuracy class: 10%
  • Maximum weight per axle: 20 t
  • Speed range: 5-90 km/h
  • Transit directions: Both
  • Technology: Optical fibre sensor
  • Dimensions WxHxD: 151/175x62x5 cm
  • Power supply: Not required
  • Digging: From 7 up to 24 cm
  • Material: Stainless stee
  • Connection to bending plates: Fiber Optic cable
  • User Interface (web): PC, tablet e smartphone
  • Power supply: 110-230 VAC
  • Optional: Printer

Data Collected

BISON, in addition to the weight, is able to supply the following data without additional devices:

parametri peso

Gross vehicle weight (GVW)

parametri velocita

Transit speed

parametri tipo veicolo

Vehicle counting and classification

parametri numero assi

Number of axles

parametri peso semiasse

Single wheel weight

parametri larghezza semiasse

Axle spacing

parametri larghezza

Axle width

parametri lunghezza

Vehicle length

parametri ruote gemellate

Twinned wheels

parametri entrata uscita

Alert transit out of one bending plate

iwim bisonte software


The software is designed directly from iWIM, it has simple and intuitive and is able to provide, immediately and clear all the necessary information of specific interest to the user.

The system can be interfaced with other ITS systems such as ANPR cameras for license plate recognition.

bison logo white