Namsan 3rd Tunnel

If you come to Namsan Tunnel No. 3 at the intersection between Namsan Hoehyeon Station and Myeong-dong Station, there is an escalator type Erebeta.

A tunnel connecting Yongsan-dong, Yongsan-gu, Seoul and Hoehyeon-dong, Jung-gu. It is a twin cave with a length of 1,280m and a width of 9.2m (two lanes, in one direction). It is a type 1 tunnel and is managed by the Seoul Metropolitan Government's Urban Innovative Facilities Headquarters. It plays an important role in connecting the downtown area of ​​Seoul with the Gangnam area. It was built from May 1976 to March 31, 1978 with a total construction cost of 9.75 billion won. The cross section of the tunnel consists of a lane width of 6.9 m (two lanes), a side band of 1.4 m, and a shoulder width of 0.8 m. The thickness of the lining for waterproofing was 100 mm and 600 mm, respectively, for the first and second layers, and the transverse gradient of the pavement was 1.5%. Currently, the wall and ceiling are partially leaking, and the condition of the wall is also poor. In addition, the lighting and fire extinguishing facilities at the entrance and exit were also in an outdated state, so repair work was carried out. As a result of the detailed safety examination conducted in October 2006, it was determined that the lining cracks and leaks, the drainage function of the drainage channel deteriorated, and the wall tiles were separated. In 2008, repair and reinforcement work was carried out. [Contents] of the repair work include concrete crack repair, cross-section repair, drainage channel maintenance, water-valley boring work, induced drainage work, tile replacement, and tunnel entry/exit landscape improvement. In order to curb the amount of vehicle traffic entering downtown Seoul, a tunnel usage fee is collected at the north end of Namsan Tunnel 3 as a congested toll fee. It is a useful tunnel from Gangnam, Seoul to Seoul Station, Myeong-dong, Sungnyemun, and City Hall. As of 2009, the average number of vehicles passing through Namsan Tunnel 3 was 47,655 per day. (Encyclopedia of Korean National Culture)