The W.I.M processor is the heart of the weighing equipment. The signals from the weigh platform are connected to the W.I.M processor. A high speed processor is used to process the data and to respond to the instructions from the main computer. The output of the W.I.M processor is connected to the computer.

The weighing software from the computer will interact with W.I.M processor and the complete data of the vehicles is recognized. Bending plate WIM systems utilize plates with strain gauges bonded to the underside. The system records the strain measured by strain gauges and calculates the dynamic load. Static load is estimated using the measured dynamic load and calibration parameters. Calibration parameters account for factors, such as vehicle speed and pavement or suspension dynamics that influence estimates of the static weight. The accuracy of bending plate WIM systems can be expressed as a function of the vehicle speed traversed over the plates, assuming the system is installed in a sound road structure and subject to normal traffic conditions.