| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 93 === Driving behavior in every country is different from the other countries. The car following with dangerous headways will be recognized as different dangerous levels by different drivers. The threshold for warning driver to take action in a Collision Avoidance System (CAS) developed in developed countries will not be suitable for the other developing countries. The microscopic survey of dangerous car following headway and basing on it to identify the threshold of safety headway is necessary. In general, due to the high dense traffic condition in Taiwan, the driving behavior is seen as more aggressive. Therefore, this study conducted a field survey microscopically to analyze the car following headway and using the braking action to identify the possible reaction to the dangerous headway. Through the statistical analysis, the scenario for safety headway are generated and input to a simulation system developed for simulating the dangerous traffic risk in this study, and then the effect of the threshold on CAS system is investigated. According the study result, the threshold will depend on the speed and has stochastic feature. The over reaction due to the inadequate warning threshold will cause new dangerous situation on the traffic surrounding the observed vehicle. This result indicates the need to revise the decision threshold value in CAS system when it will be adopted in different countries.
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