An axle weighing system consists of static or dynamic axle load scales that are usually installed directly in the road. Unlike traditional weighbridges, an axle load scale can determine the weight for each individual axis. Algorithms are used to convert the signal generated by the sensor installed in the ground into weight.
The overall weight of the vehicle is calculated by adding up all the axle loads.
An axle can also be weighed dynamically while the vehicle drives over the axle load scale (Weigh In Motion).