In this paper, I describe the development of a traffic environment simulation system with high level interactions and reality, utilizing the technology of virtual space construction and real time display. I constructed the roads to be designed and all other traffic environments in the virtual space, and realized free driving in the virtual space with real time display on GWS's and easily operated user interface. As the result, the real time simulation system of high way inter-junction with two lanes, thirteen lamps of twelve kilometer length, twenty-six meter of maximum altitude difference, thirty-five road signs, and 100 thousand polygon became possible.
