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This study proposes an evaluation method for a verbal interface while driving. In this method, the reaction time is measured and the rate of the delayed reaction time trial is used as an index. We have designed a new reaction time test procedure that contains stimulus, perception, attention, choice and response. Based on results of an actual vehicle experiment, we indicate that our method has better examination capability than using the average reaction time as an index and that we can find the time that tends to delay the reaction during a verbal task by processing the delayed reaction time trial.