In the right turn at intersection, driver’s eyes are directed to right traveling direction while monitoring oncoming vehicle. This situation is a dual task which requires appropriate attention allocation by central view and peripheral view. In this study, a performance test to measure this kind of attention allocation ability was proposed. Through an experiment with 18 participants, it was found that sum of response errors to visual stimulus may reflect the ability, especially in the highest level of task difficulty. As for reaction time to the visual stimulus, it correlated with the scale for independent and interdependent construal of self.