In a radar apparatus, when the width of a target cannot be determined, the width is estimated in such a manner as not to erroneously identify the lane in which the target is traveling. Denoting the actual width of the target by D, the distance to the target by R, and the scanning step width of projection angle by A, the estimated value W for the width of the target is computed in accordance with the equation W=D-2R tan A.

 
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