1. 1) Hai, D. T., Yamada, H., Katsuchi, H.: Present condition of highway bridges in Vietnam: an analysis of current failure modes and their main causes, Structure and Infrastructure Engineering, Vol.3, No.1, 2007.3.
2. 2) Moses, F.: Weigh-in-Motion system using instrumented bridges, ASCE, Vol.105, No.TE3, pp.233-249, 1979.
3. 4) Matsui, S., El-Hakim, A.: Estimation of axle loads of vehicles by crack opening of RC slab, Journal of Structural Engineering, Vol.35, pp.407-418, 1989.
4. 5) Ojio, T., Yamada, K., Kainuma, S., Kobata, T., Furuichi, T.: Estimation of traffic loads using strain recording in orthotropic steel deck, Journal of Structural Engineering, Vol.44A, pp.1141-1151, 1998.