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This paper contains the results of 50% offset frontal collision tests which were conducted in order to analyze impact situation of ankle/foot regions during car-to-car crashes with both 50km/h running speeds. We took high-speed films of the footwell regions, and measured impact forces of Hybrid-III lower legs, three-axis accelerations of the toe-board, floor and brake pedal in the tests. In the same collision configuration, we conducted the tests under four different test conditions of driver seating situations as follows: with seatbelts + stepping on the brake pedal, with seatbelts + stepping on the accelerator pedal, without seatbelts + stepping on the brake pedal, and without seatbelts + stepping on the accelerator pedal. In this paper, we focused on motions and impact forces of lower legs, on intrusions and movements of the floor, toe-board and pedals, and on interactions with them during crashes.