The first use of urban tunnel with upper vents is HongXing road tunnel in ChengDu.

成都市红星路下穿市政隧道首次采用了顶部开孔的自然通风方式。

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Now that there is a new tunnel, the road is less dangerous.

既然有了一个的新的隧道，这条路就比较不危险了。

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Now that there is a new tunnel, the road is less dangerous.

既然有了一个新的隧道，这条路就比较不危险了。

youdao

Now that there is a new tunnel, the road is less dangerous.

既然有了一个新的隧道，这条路就比较不危险了。

youdao