6. Tianchih is an important landmark on the highway and is named after the lake in the high mountains. The lake, a few kilometers away from Jhongjhihguan, is 2,200m above sea level.
7. Kuaiku (檜谷) is 11km from Tianchih and is an area of natural coniferous forests featuring towering evergreen trees. A variety of birds live in the forest. It's a great spot for bird-watchers.
8. Daguanshan Tunnel (大關山隧道), 11km from Kuaiku, is 2,722m above sea level and is 615m long. It divides Kaohsiung from Taitung. The weather and vegetation at the opposite ends of the tunnel vary tremendously. This tunnel draws curious crowds in winter when icicles form inside it and seas of clouds emerge around the area adjacent to Yakou.
For Sinying (新營) and areas northward, take National Highway No. 3 to get off at Sinying Exit. Change to Expressway No. 84 at the 334km marker and head for Yujing, where a connection to Provincial Highway No. 20 can be made.
From the Tainan area, take National Highway No. 8 to Sinhua (新化) and connect to Provincial Highway No. 20 at Tsochen (左鎮).
From the Kaohsiung area, take National Highway No. 10 to Cishan (旗山) and connect to Provincial Highway No. 21. Change to Provincial Highway No. 20 at Jiasian (甲仙).