It is difficult to explode the encumbrance of trip decision choosing for traffic participants because that is deliberate.

This paper focuses on relationship of the people,vehicles,roads and the environment and road safety,analyses briefly the research directions and contents of the current road traffic safety study on traffic participants,road conditions,safety of facilities and the natural environment,traffic information and so on.

First, the collected data were used in the Traffic and Environment Model (TEM) to estimate the existing network traffic performance in terms of congestion, mobility and environmental quality.