weigh-in-motion or weighing-in-motion (wim) devices are designed to capture and record the axle weights and gross vehicle weights as vehicles drive over a measurement site. unlike static scales, wim systems are capable of measuring vehicles traveling at a reduced or normal traffic speed and do not require the vehicle to come to a stop. this makes the weighing process more efficient, and, in the case of commercial vehicles, allows for trucks under the weight limit to bypass static scales or inspection.