讨论了我国收费道路的闲置问题，其原因是现行的车辆通行费制度反向调节车流量。
The problem is caused by present road tolling system which adjusts vehicle flux to a unreasonable level.
公路收费理论的研究结果表明，公路建设资金的相对短缺是推行公路车辆通行费制度的根本原因。
From the study of the highway tolling theory, it is indicates that the main reason for the country to collect the highway toll on passing vehicles is the shortage of the highway construction funds.
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