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Road traffic safety is related to the safety of people's lives and property and the overall situation of economic and social development. Road traffic accidents are the major factors threatening urban public safety, and they are also the public issues that are paid attention by all countries all over the world. Road traffic safety is a worldwide topic, which is defined by the World Health Organization as "public health crisis". The 2030 agenda for sustainable development, adopted by the United Nations in 2015, requires that the number of road traffic accidents worldwide be halved by 2020. China is a country with a large population as well as a big automobile country, so the risk of road traffic safety is very serious. With the acceleration of China's economic growth and urbanization process, China's urban transportation mode is also undergoing profound changes. In the past three decades, the number of motor vehicles in China has grown explosively, and the challenges to road traffic safety have become increasingly severe. With more people and more vehicles, road traffic accidents occur frequently, and road traffic safety risk is urgent. Official statistics show that China's road traffic safety risks should be vigilant, with 60000 deaths caused by road traffic accidents every year. The change trend of road traffic accidents in China is similar to that in developed countries, which shows an inverted U-shaped distribution of first increase and then decrease. However, the historical downward trend of road traffic accidents has not continued. In recent years, the reduction rate has narrowed significantly, and even rebounded, indicating that we still need to be vigilant against the surging of road traffic safety risks.
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