Urban Road Act Article 12
In consideration of the necessity of traffic flow and safety, the urban road authorities, in coordination with the relevant authorities, shall build elevated crossings whenever possible at the intersections of two main roads or at the crossings of highways and railroads.
中文原文 市區道路條例第12條
兩條主要道路交叉或與公路鐵路相交處，應視交通量及交通安全之需要，由市區道路主管機關與有關機關協商，儘量建立立體交叉通過之。