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This paper introduces a VR city model developed for research in driving simulation, driver behavior, and vehicle emissions. The project is a part of an interdisciplinary multi-year academic research grant at Arizona State University. First, the outline of the research is explained. The methods of VR city modeling are then introduced. The modeling process of creating road and intersection networks and traffic flow is explained. The system integration with a PC, modeling and VR software, and a Drive Simulator is illustrated. A research study of driver behavior and vehicle emissions is detailed. Next, a case study linking research in ecological driving with a simulator and Japan's National Agency for Automotive Safety & Victims' Aid is examined. Lastly, computational tools to extract driving behavior data and future endeavors are discussed.