National Freeway 3

National Freeway 3 (Chinese: 國道三號; pinyin: Guódào sān hào), also known as Formosa Freeway (Chinese: 福爾摩沙高速公路; pinyin: Fúěrmóshā gāosù gōnglù), is a freeway in Taiwan. It is the second north–south freeway in Taiwan, beginning in Keelung City at Jijin Interchange on the provincial highway 2 (Jijin Road) and ending in Linbian, Pingtung on the provincial highway 17. It is the longest freeway in Taiwan with a total length of 431.5 km (268.1 mi). The freeway also has a spur route, Freeway 3A.

The highway has 58 interchanges, 15 junctions, 7 service areas and 3 rest areas en route. Aside from the 58 public interchanges, there are also some interchanges reserved for governmental usage.