All Weigh-In-Motion (WIM) system sensors are either bending plates on frames embedded in concrete or piezo sensors epoxied into the pavement. Another alternative sensor is the load-cell. (Caltrans typically does not use load cells due to the long installation times that require extended traffic lane closures.) Inductive loops are placed before and after the WIM sensor array. Loops measure vehicle speed and overall length. A smooth pavement surface is the key to accurate weight readings. This helps dissipate any stored energy in the form of vertical displacement resident in the vehicle suspension while driving over the WIM sensors. Smooth pavement and proper calibration ensures quality and consistency in weight data.

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