Weigh In Motion (WIM)

Overloading has become a stubborn disease in road transportation, and it has been repeatedly banned, bringing hidden dangers in all aspects. Overloaded vans increase the risk of traffic accidents and infrastructure damage, and they also lead to an unfair competition between “overloaded” and “not overloaded.” Therefore, it is very important to ensure that the truck meets the weight regulations. A new technology currently under development to more effectively monitor and enforce overloads is called Weigh-In-Motion technology. Weigh-in-Motion (WIM) technology allows trucks to be weighed on the fly without any disruption to operations, which will help trucks travel safer and more efficiently.

Overloaded trucks pose a serious threat to road transport, increasing the risk to road users, reducing road safety, seriously affecting the durability of infrastructure (pavements and bridges) and affecting fair competition among transport operators.

Based on various disadvantages of static weighing, in order to improve efficiency through partial automatic weighing, low-speed dynamic weighing has been implemented in many places in China. Low-speed dynamic weighing involves the use of wheel or axle scales, mainly equipped with load cells (the most accurate technology) and installed on concrete or asphalt platforms at least 30 to 40 meters long. The software of the data acquisition and processing system analyzes the signal transmitted by the load cell and accurately calculates the load of the wheel or axle, and the accuracy of the system can reach 3-5%. These systems are installed outside driveways, in weighing areas, toll booths or any other controlled area. The truck does not need to stop when passing through this area, as long as the deceleration is controlled and the speed is generally between 5-15km/h.

High Speed ​​Dynamic Weighing (HI-WIM):
High-speed dynamic weighing refers to sensors installed in one or more lanes that measure axle and vehicle loads as these vehicles travel at normal speeds in traffic flow. The high-speed dynamic weighing system allows weighing almost any truck passing through a road section and recording individual measurements or statistics.

The main advantages of High Speed ​​Dynamic Weighing (HI-WIM) are:
Fully automatic weighing system;
It can record all the vehicles – including the speed of travel, the number of axles, the time elapsed, etc.;
It can be retrofitted based on the existing infrastructure (similar to electronic eyes), no additional infrastructure is required, and the cost is reasonable.
High-speed dynamic weighing systems can be used for:
Record real-time loads on road and bridge works; traffic data collection, freight statistics, economic surveys, and pricing of road tolls based on actual traffic loads and volumes; Pre-screening inspection of overloaded trucks avoids unnecessary inspections of legally loaded trucks and improves operational efficiency.

Post time: Apr-03-2022