On December 7, 2018, shanxi visits Taiyuan town, on the Tian Longshan with local top height above sea level, the trestle of whirly design establishs a three-layer to support at hill, be by what the netizen says " switchback " type trestle. This paragraph of highway also is known as the most beautiful " the travel highway on high in the clouds " . Headroom looks down at this travel highway, illegallying or forcibly occupy a long dragon like the summit. This is known as " the travel highway on high in the clouds " be about to complete. Local citizen says, in group of continuous peaks of hill, drive way this paragraph of three-layer is whirly when type trestle, be just as take " switchback " general. As we have learned, this a section of a highway undertakes multilayer and whirly design, it is to consider hill route goes situation, prevent gradient to cause hazard greatly too. The driver says, drive in " switchback " the travel on type trestle, three-layer is whirly sense letting a person seems bear down on high in the clouds. Whenever issue a kind of green tea, "Switchback " type trestle cloud and mist winds around, especially beautiful. Below sunshine illuminate, "Switchback " type trestle is smooth shadow crisscross, scenery happy person. "Switchback " type trestle attracts car of numerous citizen drive tens of kilometers come round to take a picture take a photo as a souvenir.