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山区道路的特点是山高、坡陡、坡长、弯多弯急、道路狭窄、视线不良，因此，道路交通事故特别是群死群伤特大恶性翻车事故大多发生在山区。据统计，全国每年约有7万人死于交通事故，属山区道路特大恶性事故造成的竟达20％之多，给国家、集体和人民群众生命财产造成了惨重的损失
The characteristics of mountainous roads are mountainous, steep slopes, long slopes, curved bends, narrow roads and poor sightlines. Therefore, most serious road accidents, especially road traffic accidents, occur in mountainous areas. According to statistics, about 70,000 people die of traffic accidents every year in the country, which is as much as 20% caused by the extremely serious road accidents in mountainous areas, which have caused heavy losses to the life and property of the country, the collective and the people.