New Central Cross-Island Highway

The New Central Cross-Island Highway, also known as the New Central Trans-Island Highway, is an incomplete highway in Taiwan intended to connect the east and west across the central region of Taiwan Island. Positioned between the Central Cross-Island Highway and the Southern Cross-Island Highway, it centers on Jade Mountain and branches into three routes: Chiayi–Yushan, Shuili–Yushan, and Yuli–Yushan, forming a Y-shaped road network. Although designed around Yu Shan, the actual junction was initially planned at Shalixi Stream, later adjusted to Dongpu Mountain Pass, and is now known as Tatajia, the highway's highest point at 2,610 meters.

In the 1970s, during the Ten Major Construction Projects, the Republic of China government planned to build three new cross-island highways, listed as one of the Twelve Major Construction Projects. By the 1980s, construction of the New Central Cross-Island Highway faced challenges due to growing ecological awareness and the establishment of Yushan National Park along its route, creating a turning point between highway development and environmental conservation. After six years of policy indecision, construction was briefly permitted to extend westward to Dafen by the Veterans Engineering Agency (now Retired Servicemen's Engineering Agency). However, following an Environmental Impact Assessment, the Executive Yuan issued an order to abandon construction, resulting in partial completion and the highway opening on January 1, 1991, as a "highway without full traversal."