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A new pedestrian dummy, called ""POLAR'' has been recently developed. It can be used as a tool not only for the investigation of the mechanism of pedestrian accidents, but also for the assessment of vehicle aggressiveness to pedestrians. This dummy is modified from "'THOR,'' new- generation occupant dummy, in its body structure to reproduce human body kinematics in the event of collision with a vehicle more precisely. Its knee has a human-like structure, with condyles which shape is similar to that of human knee, meniscus, cruciate ligaments and collateral ligaments. Tibias of Polar are made of urethane which bending characteristic is that of human tibia. These features not only make the lateral bending and shearing responses of the leg and knee more human-like but also the whole body kinematics more human- like.