Analysis on alteration of road traffic casualties in western China from multi-department data in recent decade.

In terms of time distribution, the CFR showed a trend of gradual increase before 2015 and gradual decrease after that point.

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The HI and MRV present a decreasing trend.

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While, an increasing trend has emerged after 2015.

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However, the frequency of road accident both in western and eastern fluctuated from 2016 to 2019, with an overall trend of increasing.

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