利用拟合的分布控制行程时间的中心线、上下限，从而对行程时间的可接受极限值进行界定，对道路网行程质量进行控制。
The range of acceptable traveltime can be obtained through the center, upper and lower bounds controlled by fitting distribution in quality control.
利用拟合的分布控制行程时间的中心线、上下限，从而对行程时间的可接受极限值进行界定，对道路网行程质量进行控制。
The range of acceptable traveltime can be obtained through the center, upper and lower bounds controlled by fitting distribution in quality control.
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