許添本2006-07-252018-07-092006-07-252018-07-092005http://ntur.lib.ntu.edu.tw//handle/246246/2912本研究主要係利用實際車流之觀測與分析，建構一動態防撞門檻，以行為門 檻模式建構一車流模擬系統，設計不同車流情境模式，對防撞門檻進行績效評估。 本研究期望利用實地攝影調查，蒐集包括速度、加速度、相對距離、相對速 度及煞車與否等資料，校估符合大部分駕駛之動態安全門檻。未來結合模擬系 統，以偵測所得之周圍路況即時資料為輸入，透過事先建立模擬模式及動態安全 門檻，預測行進中車輛之未來行車安全等級，並針對未來可能發生危險之情況， 即時給予駕駛人安全警示，提醒其採取應對策略，以降低車流衝突並提高車流穩 定度。由模擬結果可知，當加裝防撞系統後，車輛之行車安全及跟車平穩度績效 均較無防撞系統之車輛有顯著之進步。而行車平穩程度及行車效率怎無明顯差 異。而當反應時間較長、越靠近緊急剎車之車輛和期望速度越高之情況，其有無 防撞系統之績效差異越大。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 totally suitable for the other developing countries. The microscopic survey of dangerous car following headway and 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. This result indicates the need to revise the decision threshold value in CAS system when it will be adopted in different countries.application/pdf218652 bytesapplication/pdfzh-TW國立臺灣大學土木工程學系暨研究所防撞系統動態門檻車流模擬Collision Avoidance SystemWarning ThresholdTraffic Simulatiionreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/2912/1/932218E002118.pdf