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This paper presents a rule-based high-speed warning system for highly safe cruise control in intelligent vehicles. All the dangerous states are defined in advance by rules which are represented by the conjunctions of condition entries, so that they can be detected by search operations between input information from sensor signals and rules. Moreover, a new content-addressable memory(CAM) is proposed for highly parallel search operations. Finally, it is demonstrated that the speed for search operations using the proposed CAM becomes twenty-five times faster than that using a conventional CAM.