An optical fiber sensing system according to the present disclosure comprises: an optical fiber (10) that is disposed along a road R and that detects vibrations; a detection unit (21) that detects, from optical signals received from the optical fiber (10), the vibration patterns of vibrations arising due to a traffic accident which has occurred on the road R; and an estimation unit (22) that estimates the state of the traffic accident on the basis of the vibration patterns.
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