The planning report for this project was reviewed and approved in principle at the 1,318th meeting of the Council for Economic Planning and Development (CEPD) of the Executive Yuan on February 18, 2008. The project was approved for phased implementation, with both medium-short-term and long-term plans, prioritizing the medium-short-term development.

The original project duration was set at seven years, with a total estimated budget of NT$15 billion. The project was officially approved by the Executive Yuan on March 13, 2008, under Official Letter No. 0970009352.

At present, detailed design and land acquisition procedures have been completed. In consideration of construction scheduling needs, strategies to expand work zones and accelerate construction progress were developed, aiming to shorten the total construction period from the original seven years to five. This adjustment was made to ensure timely completion of the full electrification of the Hualien–Taitung Railway Line by the end of 2013.

The C1 section of the Anshuo to Caopu segment of the South Link Highway (Provincial Highway No. 9) extends from kilometer mark 0K+000 to 6K+300, with a total length of 6.3 kilometers. Located across Daren Township in Taitung County and Shizi Township in Pingtung County, the project forms part of a broader initiative to upgrade and expand the South Link Highway, with the aim of improving transportation efficiency and enhancing travel safety in eastern Taiwan.

The new alignment proceeds from north to south, traversing the broad lower river valley of the Anshuo River. This section of the river is currently protected by existing levees. To minimize disruption and reduce land acquisition costs, the alignment is positioned along the outside of these levees. The route then skirts the edges of the Daren and Anshuo communities, crossing the Anshuo River near its confluence with the Wufugu Creek, a tributary of the Anshuo River.

Following the river crossing, the route meanders along Wufugu Creek, passing through multiple ecologically sensitive riparian areas and steep slopes before terminating at the northern entrance of a new tunnel section.

The Dajia to Da’an section of Provincial Highway No. 61 (West Coast Expressway) in Taichung City was initially constructed as an at-grade road to meet local development needs. As part of this configuration, thirteen at-grade intersections were designed to connect the expressway with local roadways. Since its opening in 2000, this section has experienced a high frequency of traffic accidents at these intersections due to increasing vehicular volumes, posing significant safety concerns for road users.

To enhance roadway safety and improve overall traffic efficiency, the Directorate General of Highways (DGH), through the Central Region Construction Office for the West Coast Expressway, initiated the “Elevated Mainline Construction Project – Dajia to Da’an Section” in 2011. The elevated structure is designed to bypass all existing at-grade intersections, thereby segregating express traffic from local flows.

The Taiwan Taoyuan International Airport Access MRT System, commonly known as the Taoyuan International Airport MRT, is a rapid transit system planned to connect Taipei and Taiwan Taoyuan International Airport, before linking up with the Taoyuan MRT to THSR Taoyuan Station and onwards to Zhongli. 

Construction began in 2006 and the system is scheduled to begin service in June 2013. Construction is being overseen by the Bureau of High Speed Rail of the Ministry of Transportation and Communications, which oversees the construction of the Taiwan High Speed Rail as well as regional rapid transit systems (except the Taipei Metro and Kaohsiung MRT) in Taiwan.

Constructed method of CE03B

1.Balanced cantilever

2.Cast-in place method

3.Advance shoring method

4.Steel box girder

The C705 contract section (Songzhu to Yucai segment) is part of Taichung’s Urban Road Network Project, integrating the eastern segment of Route 2, the northern segment of Route 4, the at-grade road extensions, and the Dali connector. This project adopts the BE post-tensioning system. It plays a key role in forming a complete expressway system in the Greater Taichung area, connecting National Highways No.1 and No.3, the Zhongtou Expressway, and the Zhongzhang Expressway to maximize transportation efficiency.

Upon completion, travel time between Tanzih and Wufeng will be reduced from the current 60 minutes via Provincial Highway 3 to just 15 minutes. The project is expected to save approximately 2.44 million liters of fuel and reduce carbon dioxide emissions by around 5,500 metric tons annually. Moreover, by replacing part of the cement with ground granulated blast furnace slag (GGBFS), approximately 21,000 metric tons of cement use will be avoided, contributing to a further CO₂ reduction of around 19,000 metric tons—highlighting the project's strong environmental commitment.