There is also a related issue involving highway overpasses .

还有一个问题是与高速公路立交桥相关的。

There are more and more overpasses in big cities .

大城市里立交桥越来越多.

I also find more overpasses and elevated highways have been built .

我也发现建造了更多人行天桥和高架道路。

We can see signs of modern overpasses in this ancient bridge .

我们能从这座古桥上看到立交桥的影子。

Is that why they 're constructing so many underpasses , overpasses and highways ?

那就是他们建这么多天桥、地下通道和公路的原因吗？