卡车往内地输送货物，回程却是空载。

Trucks carry goods inland, but return empty.

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2002年，一项关于2万次运输行程的研究发现，只有2.4 ％的回程能找到合适的返回装载货物。

A 2002 study of 20,000 haulage trips found that only 2.4% of return journey legs found suitable backloads.

youdao

有一条禁止卡车在回程载运货物的规定。

There is a rule prohibiting a truck from carrying goods on its return haul.

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