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In this paper,an infrastructure sensor system was developed for vehicleclassfication based on fiber Bragg grating(FBG)sensors.A FBG were packaged by fiberreinforced polymer(FRP)materials as an infrastructure sensor to classify vehicles into differentclassifications.Field testing was performed at MnROAD facility,Minnesota DOT(MnDOT),which approved the effectiveness of the developed infrastructure sensor system for vehicleclassification.The advantages of the robustness of the proposed system will enable a reliablevehicle classification for both low-speed and high speed WIM without any sensors on-board avehicle.