Design code value for traffic load is based on real measurements such as Weight In Motion. The Venoge bridge is located near the Denges WIM station, and it is equipped with strain gauges: it is therefore a perfect subject for this study. The aim of this thesis is to directly link the WIM traffic recorded at the station In Denges with the strain gauges data from the Venoge bridge. This would allow an evaluation of the validity of the WIM data and also give an estimation of the relative model error of a bridge model regarding fatigue analysis.