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<p>The live load model applied to the design of the bridge should be defined so that a target safety level can be secured in the actual traffic environment. In this paper, it is presented that the live load could be greatly affected by the measurement data used for the statistical estimation process. For this purpose, a statistical analysis is performed on WIM (weigh-in-motion) data measured during different periods in terms of the overload control at the same spot of an expressway in Korea. The effects by a single vehicle, the back-to-back series vehicles and the side-by-side parallel vehicles are obtained and compared.</p>