This study aims to regulate the sensitivities of various driving related measures that are used to assess the driver interfaces in driving support systems. In the tracking situation, generally, measures of drivers' operations were relatively sensitive than vehicle location measures, and it was confirmed the measures that revealed significant differences during driving on a simulator were also valuable during actual driving. In the detection-response situation, ratio of collisions detected interface difference only when the situation had relatively high urgency. However, operation measures, e.g., reaction times to press brake pedal, and glance behaviors were sensitive to detect differences even if no-collisions were observed in less urgent situations. Subjective ratings and glance behaviors revealed generally good sensitivities. Based on the obtained results, primary and secondary importance of driving measures were discussed.