*Displacement Signals*

Figure 2 presents a typical deflection basin of the pavement, during the passage of a 5-axle heavy vehicle, generated with the ALIZE Software. The signal presents five peaks in the downward direction, corresponding to the five axles of the vehicle. The amplitude of the deflection depends on the axle loads, and the vehicle speed. For the geophones and accelerometers, the objective is to integrate the signals, in order to convert them into correct deflection values. As each negative peak in the signal corresponds to one axle of the vehicle, vehicle silhouettes can also be identified by counting and matching these peaks.
