Because of the lack of data, little research has been done to evaluate the safety performance of Electronic Toll Collection (ETC) systems.
由于数据缺乏，国内外有关ETC对交通安全影响的评价研究开展甚少。
Because of the lack of data, little research has been done to evaluate the safety performance of Electronic Toll Collection (ETC) systems.
由于数据缺乏，国内外有关ETC对交通安全影响的评价研究开展甚少。
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