How the WIM system works

Measurement is performed automatically as the vehicle passes through the equipped road section. The driver is not required to stop on a separate scale.

Vehicle passing through the WIM measurement section

Vehicle passage

The vehicle passes through the measurement section.

Load measurement

Weighing sensors in the pavement record the impact of each wheel and axle.

Signal processing

The WIM controller receives sensor signals and determines the passage parameters.

Parameter calculation

The system calculates gross vehicle weight, axle loads, number of axles, speed and other measured parameters.

Data generation

Results can be combined with the licence plate number, vehicle photographs, class, dimensions and other data from the complex.

Low-speed and high-speed WIM

Low-speed WIM

Mass and axle loads are measured at speeds of up to 10 km/h. This mode is used at control points, customs posts, borders and other sites where vehicles pass through the control zone at reduced speed.

High-speed WIM

Mass and axle loads are measured at speeds above 10 km/h without interrupting traffic flow. These systems are used on highways of national significance, trunk roads and toll sections where automatic control of vehicles in motion is required.

Weighing sensors

The WIM system is based on sensors installed directly in the measurement zone of the pavement. The sensor type is selected according to the required operating mode, station design and the metrological requirements of the project.

Piezoelectric sensors

Piezoelectric sensors are installed across the traffic lane and convert the mechanical impact of the vehicle wheels into an electrical signal. They are used in dynamic weighing systems, including on high-speed sections.

Asia Great piezoelectric weighing sensor

Strain-gauge sensors

Strain-gauge sensors measure load from the deformation of the sensing element. These sensors are used in various configurations of dynamic and low-speed weighing systems.

Installation of sensors in the pavement

The accuracy and stability of WIM depend not only on the equipment, but also on proper preparation of the measurement section and installation of the sensors.

Marking out the measurement zone
Preparation of the pavement and installation slots
Installation and positioning of sensors
Connection of measurement cables
Filling with a specialised installation and sealing compound
Inspection of the installed measurement section

Controller and signal processing

The WIM controller receives signals from weighing sensors and other devices of the measurement section, processes them and generates the parameters of each vehicle passage.

Main WIM data

Gross vehicle weight
Load on each axle
Number of axles
Axle spacings
Travel speed
Time of passage
Vehicle classification — with the corresponding system configuration

Licence plate number, photographs, dimensions and other parameters can be added from related subsystems of the complex and combined into a single data package.

Components of the WIM complex

The specific equipment set is determined by the tasks and configuration of the site.

Weighing sensors
Presence detectors / inductive loops — where required
WIM controller
Industrial control cabinet
Network and communications equipment
Server hardware and software
Licence plate recognition system — where required
Overview cameras — where required
Dimension control system — where required
Data transmission channels and integration with information systems

WIM calibration

After installation and commissioning, the measurement channels are calibrated. This uses control vehicles with known parameters that make a series of passes through the measurement section.

Based on the results of the passes, system readings are checked and, where necessary, the coefficients of the measurement channels are adjusted. Calibration makes it possible to configure the system for the specific design of the measurement section and the operating conditions.

Depending on the station type, control passes may be performed at different speeds and in different traffic lanes.

Verification and metrological confirmation

For WIM systems to be used in the field of regulated measurements, the equipment and the system must comply with the metrological requirements established for the specific project and area of application.

After the system is put into operation, the prescribed inspection and verification procedures for measuring instruments are carried out. The set of required documents depends on the equipment used, the station configuration and statutory requirements.

Certificates and documents

For equipment and measuring systems, the documents required by the specific project and the equipment in use are applied.

VIDAR type approval certificate for measuring instruments

AVM type approval certificate for measuring instruments

System results

WIM is part of a comprehensive transport control system. Data from the weighing equipment can be combined with information from other subsystems and transmitted to Asia Great software or the customer's information systems.

Date and time of passage
Vehicle photograph
Licence plate number
Gross vehicle weight
Axle loads
Number of axles
Axle spacings
Speed
Vehicle type / class
Dimensions — where the corresponding subsystem is present
Other station configuration parameters

The data set is determined by the configuration of the specific station.

Integration with information systems

Asia Great WIM systems integrate with the information systems of government agencies and customers. Weight and dimension control results are transmitted for further processing, storage and use in automated transport control systems.

A single event can combine data on the vehicle, gross vehicle weight, axle loads, speed and time of passage, traffic lane, state registration number, as well as photographs and other materials obtained by related subsystems of the complex.

Vehicle
→
WIM measures mass and axle loads
→
Related subsystems identify the vehicle
→
A single control event is generated
→
Exceedance of permitted parameters is checked
→
Data are transmitted to the customer's system
→
ЕРАП / administrative proceedings

Weight and dimension control event data

gross vehicle weight
load on each axle
number of axles
passage speed
date and time
traffic lane / direction of travel
state registration number — when integrated with ANPR
vehicle photograph — where a photo-capture system is present
dimension parameters — when integrated with a dimension control system
result of the permitted weight parameter check

Weight parameter exceedance control

The system compares measurement results with the established permitted parameters of the vehicle and determines whether gross vehicle weight and/or axle loads are exceeded, in accordance with the applicable rules and the configuration of the complex.

ЕРАП

Integration with ЕРАП

Unified Register of Administrative Proceedings

Asia Great weight and dimension control complexes can be integrated with ЕРАП and other government information systems. When exceedance of permitted weight parameters is detected, the system generates the required event data and materials for subsequent administrative proceedings.

Integration makes it possible to automate the transfer of control results and reduce the volume of manual processing — from recording the exceedance to preparing the administrative case file in government information systems.

Asia Great solutions are used in projects of government agencies and road organisations and are integrated with customers' information systems.

Our customers →

From project to commissioning

Asia Great carries out the design of WIM stations, equipment selection and integration, installation of sensors, commissioning, calibration, software integration and technical support of the system.

Design
Installation
Commissioning
Calibration
Integration
Technical support

Discuss a project

Send a technical assignment, measurement section requirements or a specification. Asia Great will propose a WIM system configuration for the specific site.