We bought the Taiwan GIS Dataset v1.4 from IOT (Institute of Transportation). The dataset include roads, bridges, tunnels, landmarks, and other transportation-related layers of all counties in Taiwan. The locations are represented in TWD67 UTM, TWD97 UTM, and TWD97 LatLong. Details can be found at the following link.
http://www.iot.gov.tw/np.asp?ctNode=1079
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