Provincial Highway 21 (Taiwan)
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|Maintained by Directorate General of Highways|
|Length||144.385 km (89.717 mi)|
|North end||Prov 8 in Dongshi, Taichung City|
|Nat 6 in Puli|
|South end||Prov 18 in Xinyi, Nantou|
|Highway system in Taiwan
Taiwan Provincial Highway No. 21 is a Provincial Highway in Taiwan that begins Tianleng (天冷), Dongshi District, Taichung City, at the intersection with Provincial Highway No. 8 (Central Cross-Island Highway), and ends at Tataka(塔塔加), where it is connected with Provincial Highway No. 18 (New Central-Crossing Highway) in Yushan National Park. It is the primary highway to the Sun Moon Lake, a popular tourist destination. The total length is 145 km.
A southern segment of the highway became Provincial Highway 29 in 2014. The segment was from Namasia to Linyuan in Kaohsiung City, and ran along the Cishan River(旗山溪) as well as the Gaoping River(高屏溪). The road that connects both segments between Tataka and Namasia is not built due to environmental and ecological issues.
The highway is a part of Fengpu Highway (豐埔公路) that runs from Fengyuan to Puli. The segment from Puli to Sun Moon Lake is a part of Zhongtan Highway (中潭公路), which connects downtown Taichung with the lake. The segment from Sun Moon Lake to Tataka is a part of the unfinished New Central Cross-Island Highway (新中橫公路). The cross-island highway plan was formally abandoned due to environmental concerns.
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