3 -a indicates that before 2003—with the improvement of the road system and the increase in the construction of road segments—the VCF showed a decreasing trend, and the reduction rate was relatively large.
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Evaluation of thermal effects on urban road spatial structure: A case study of Xuzhou, China.
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The sentences
After 2003, although the construction volume of road segments increased, the VCF of roads also exhibited an increasing trend.