Guideline for creation of safety and comfort bicycle environment" was enacted in 2012. The bicycle environment has been improved, and bicycle lanes has been implemented in Japan. However, on the bicycle lanes, there is no physical objects such as curbs separating between the bicycle space and the car space, thus both traffic users have no choice but to drive while affecting each other more than ever. Therefore, in this research, in order to clarify the influence of the bicycle cycling on the

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... e space as car on the car traffic, we conducted experiments in the real road space and the virtual road space. A bicycle for measuring the running behavior of the car was developed and a driving environment was created on computer graphics, and the influence on the car speed and the separation distance when the car driver passed the bicycle were examined. Furthermore, the characteristics of behavior related to overtaking the bicycle and the factors that influences on overtaking behavior were clarified.