There are an estimation of 74 sites of tectonic movements and collapsed land on the stretch between Meishan and Yako along the Southern Cross-Island Highway. The main types of collapse that have occurred were (in order): rockfall (35.1%), circular slide (14.9%), and a combination of both (12.1%), which amounts to a total of 62.1%. Other types include slumps, translational slides, and the combination of different types such as rock topple and wedge slides. The cause of collapsed land include the geological characteristics of terrane, geological structure (discontinuity, fault, and fold, etc.), a lack of slope protection vegetation, large angles of rock slope, surface soil weathering, the method of road construction, weather (rain fall, temperature), ground water, a lack of slope protection work, and construction work done by people. An analysis on the discontinuity of 959 joint sets and cleavages showed that the terrane has experienced complicated rotations and reverse rotations, which are indications of tectonic movements. The tectonic movements had fractured the rock mass in the study area, forming steep terrains. The distribution of discontinuity and large angle of rock slope are the main causes of rockfall. Slaty cleavage and weathering are the main causes of circular slides.