| Summary |
Shih-Hsuan Huang, 2007,06
Institute of Traffic and Transportation National Chiao Tung University
The occurrence of an accident generally results from a series of unfortunate factors. In order to explore the nature of road traffic accidents, this research applied decision tree to construct the scenarios of accidents.The A1 and A2 types of accident data from year 2003 to 2005, maintained by National Police Agency, were used to analyze small-size vehicles and motorcycles accidents at intersections.
Consideration the definition of accident types and issues being studied, the data was sequentially analyzed with respect to locations, geometric and environmental factors, and driver's characteristics. Furthermore, due to the unbalance of accident data and unknown exposure data, this study analyzed the tree structure through comparing the possibility of each accident type between different level and different node of trees.
The results indicated that, two-vehicle accidents at intersections could be summarized into three categories as follows. First, due to signal operations, rear-end collision and same-direction side swept accidents were significant and the associated vehicle speed changes at signalized intersections. Second, sight distance is restricted at alley-level intersections. Drivers may ignore the threat of lateral traffic flow and resulted in side-impact, head-on and cross-intersection accidents. Last, left turn crossing accidents mostly resulted from driver’s crossing at the intersections under insufficient gaps. Meanwhile, according to the driver's characteristics analysis, male drivers tended to have risky driving behaviour. |
