Weigh-In-Motion (WIM) is a technology that can be used for various applications related to the weights and axle loads of road and rail vehicles. WIM systems are installed on the road or rail track or on a vehicle and measure, store and provide data from the traffic flow and/or the specific vehicle.
WIM systems measure the dynamic axle loads of the vehicles and try to calculate the best possible estimate of the related static values. The WIM systems have to perform unattended, under harsh traffic and environmental conditions, often without any control over the way the vehicle is moving, or the driver is behaving.
These conditions have an impact on the quality and reliability of the data measured by the WIM system and of the durability of the sensors and WIM system itself. As a result a successful implementation of a WIM system requires specific knowledge and experience.