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It is of important practical significance for the drivers under emergency to make accurate judgment and operation in time. In this paper, Freecord data collection system, dynamic GPS are used in the research of driver＇s braking operation under emergency in the Transportation Communication Trial Field. In the first place, the relationship between braking force and the distance from obstructions, as well as driving velocity, has been analyzed; in the second place, the model of the relationship has been established; at last, the model has been validated whose result means a lot for the management of the driver＇s safety and traffic safety. © 2012 American Society of Civil Engineering.
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