她推导出的公式标明，交通需求量增加到一定程度会造成新路线的不再使用而不会增加出行时间。
She has derived a formula that shows that an increase in demand guarantees that the new route will not be used and will no longer increase travel times.
她推导出的公式标明，交通需求量增加到一定程度会造成新路线的不再使用而不会增加出行时间。
She has derived a formula that shows that an increase in demand guarantees that the new route will not be used and will no longer increase travel times.
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