A traffic security facility identification protective device of roadside is provided that the resources can be used commonly since the device may be adapted to the variation of a width between a pavement and a post. A traffic security facility identification protective device(100) of roadside comprises a main plate(110), and an isolation plate(130). The main plate is formed along the direction across the driving direction regardless of the variation of a road boundary stone in the state of being inserted in a post, wherein a slot(112) of which the diameter is larger than the diameter of post is included.
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