Low bridge, could show you there's a sharp turn, slow down.

低桥，可以告诉你有一个急转弯， 减速。

And of course, what this meant was that the dimension of its head was entirely determined by the lowest motorway bridge that it had to travel under on its tour.

当然，这意味着它头部的尺寸完全取决于它在旅行中必须经过的最低的高速公路桥。