| http://www.w3.org/ns/prov#value | - When the data obtained at this time is as shown in FIG. 11B the position of the preceding vehicle D calculated based on the beat obtained at this time is a position indicated by a mark Y in FIG. 118 which means that the preceding vehicle D is located outside the guard rail G. In such a case, according to the present invention, the continuity of the position of the preceding vehicle D is not judged
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