Keywords: Taiwan road sign Art049.png 中華民 警告標誌警42:雙向道 Taiwanese Warning Sign W42 Two Way Traffic File ROC2003-09-24道路交 標誌標線號誌設置規則 pdf 第四十 Article 49 1989-12-15 gov tw PD-ROC-Traffic Signs Diagrams of warning road signs of Taiwan Two-way traffic-related warning road signs |