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What is the L-shaped network? What benefits does it bring to passengers?(Planning)

The Taipei MRT network consists of several L-shaped routes - Red, Green, and Orange lines - that intersect each other twice. The downtown grid-shaped network also forms 12 transfer points, giving passengers multiple alternatives to reach their destination. Except for trips between the Orange (Zhonghe-Xinlu) line and Brown (Wenhu) line, no more than one transfer will be needed for passengers to get to their destination.