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The multi-sensor and mechanical WIM systems were characterised. The assumption of the necessity of simultaneous analysis of vehicles types (by number of wheels, e.g. two-wheelers, four wheelers, etc.) participating in traffic, was made. This type of analysis involves not only the measurement of vehicle weight but also qualitative detection. Such data are mainly collected and analysed in urban traffic, in which information on traffic volume, lane occupancy or the number of vehicles waiting to enter an intersection are important to ensure continuous, smooth traffic flow. This article presents a design of a WIM system in which the detector is a beam with Bragg grating optical fibre sensors glued on it. Four cases of beam load were determined, due to its strength and the ability to register deformations. The strength analysis of the beam was carried out with the help of MES and its shape was optimised.
