The complete control of highway environment and traffic scenarios provided by the NADS will allow researchers to set up hazardous situations and measure driver response. The NADS will offer the capability to study driver crash avoidance behavior and carry out related accident reconstructions. Under these restrictions, the study of driver response during critical crash avoidance situations becomes a practical impossibility. However, many such experiments cannot be conducted without exposing the driver to unacceptable physical danger. The most valid method of conducting such research is to make observations while the driver is engaged in the actual driving task, in a real vehicle, operating on a real highway. Of the three elements of this system, the driver is unique as the single element that is non-deterministic, i.e., driver behavior defies description or prediction by means of common physical laws.As a consequence, the only practical means of studying driver behavior is by means of direct observation. The National Advanced Driving Simulator (NADS) is a research tool that will be used to conduct fundamental research into the operation of the complex driver-vehicle-environment system. The National Advanced Driving Simulator (NADS) And Intelligent Transportation System (ITS) Program
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