Article 27 warning lights, warning marks or safety protection facilities shall be set up at a crossing where a railway and a road intersects on a plane.
第二十七条铁路与道路平面交叉的道口，应当设置警示灯、警示标志或者安全防护设施。
For example, one triangle shape was cut out crossing the grid between the first floor and the second, and placed beyond the X and Y coordinate plane.
例如，一个三角形的形状被切断穿过一层和二层之间的网格，并放置在一个平面和坐标平面之外。
The method of this model suits not only road plane design, but also road profile design, crossing design, pipeline design, etc.
本模型的建模思想不仅适合于道路平面设计，今后还可应用于道路纵断面设计、横断面设计、管线综合等。
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