Low-Speed WIM

Appointment LS-WIM

In some cases it becomes necessary to control the weight of vehicles as accurately as possible. In order to increase the efficiency of control through partially automated weighing, the concept of Low Speed WIM (Low Speed WIM) was developed and implemented.

LS-WIM consists of the use of wheel or axle scales mainly equipped with load cells – the most precise technology – and installed on concrete or solid asphalt platforms at least 30 to 40 meters long.

The data acquisition and processing system software is designed to analyze the load cell signal with regard to speed and to calculate the exact wheel or axle loads. Such systems are installed either outside lanes, at weighing sites, toll plazas, or in any other controlled area.

Operating speeds are typically in the 5 to 15 km/h range. The LS-WIM concept was first introduced in the UK, as well as several states in North America and provinces in Canada and Australia. European countries (Germany, France, Belgium, etc.) and Japan have joined it after recognizing the effectiveness of this approach.

Typical LS-WIM specifications:

The name of the characteristic	The value of the characteristic
Lane length	37m
Weighing technologies	Strain gauges
Max load on axle	30-40t
Accuracy	1% (verification) 2% (operation) at a speed of 10-20 km/hour
Scale value	10-20 kg
Protection class	IP68
Operating temperatures	-40 - +80

Hardware

Weighing module

Video fixation module
ANPR cameras	Plates recognition, violations detecting
Viewing cameras	Video fixation of weighing process

Traffic control module
Traffic lights	Traffic control near the weighing area
VMS scoreboard	Information about the need to weigh; Information about the weighing process

Communication module	System controller, PC

Software part

WAGA-Х	Generation of weighing data, violation logging, system control
WAGA	dispatcher workstation, central data storage and processing