The exhaust gas volume, which is a major factor of the air pollution, is changed by the driving modes of the vehicle. In particular, on the congested traffic flow, its influence is considerable and complicated. Therefore, to establish the method for estimating each mode of the traffic flow is the fundamental problem. Already we have developed a simple model on the free traffic flow. In this paper, we showed a model developed by expanding the former model, to estimate the driving modes on congested flow through some actual surveys.