About 1.35 million people died in traffic accidents around the world in 2018, make this type of accidents the 8th cause of death in the world. Particularly, in Spain, there were 204,596 traffic accidents during 2016 and 2017, out of which 349,810 drivers were injured. The objective of this study was to understand to what extent seat belt non-use and human factors contribute to drivers injury severity. The results are based on the information and 2016–17 data provided by the Spain national traffic department “Dirección General de Tráfico” (DGT). The discretization model and Bayesian Networks were developed based on important variables from the literature. These variables were classified as; human factor, demographic factor, conditioning factor and seat belt use. The results showed that failure to wear the seat belt by drivers are likely to increase the risk of fatal and sever injury significantly. Moreover, distraction and road type road can contribute to the accident severity.

中文翻译：

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安全带的使用对交通事故伤害严重性的影响

2018年，全球约有135万人死于交通事故，这是世界上第八大死因。特别是在西班牙，2016年和2017年共发生204,596起交通事故，其中349,810名驾驶员受伤。这项研究的目的是了解不使用安全带和人为因素在多大程度上导致驾驶员受伤严重。结果基于西班牙国家交通部门“DirecciónGeneral deTráfico”（DGT）提供的信息和2016-17年度数据。离散化模型和贝叶斯网络是根据文献中的重要变量开发的。这些变量分类为：人为因素，人口因素，调节因素和安全带使用情况。结果表明，驾驶员不系安全带可能会大大增加致命和重伤的风险。此外，分心和道路类型的道路可能会导致事故严重性。