Suraksan Tunnel
Overview
The Suraksan Tunnel is a representative road tunnel that passes through Suraksan Mountain, forming part of the First Ring Expressway of the Seoul Metropolitan Area (Expressway No. 100) connecting Nowon-gu, Seoul, and Uijeongbu-si, Gyeonggi-do. Since its opening in 2006, it has alleviated traffic congestion in the northeastern part of the Seoul metropolitan area and significantly improved accessibility between Seoul and northern Gyeonggi Province. The tunnel has four round-trip lanes (two lanes per direction), with a total length of approximately 2.3 km, and functions as a core section of the Seoul metropolitan ring expressway network.
Main Content
Construction Background and History
The First Ring Expressway of the Seoul Metropolitan Area was planned as part of a metropolitan transportation network from the 1990s, with the aim of constructing an expressway encircling the outskirts of Seoul to disperse downtown traffic. The Suraksan Tunnel was included in the northeastern section (Toegyewon IC ~ Uijeongbu IC) and was planned to overcome the topographical obstacle of Suraksan Mountain. Construction began in the early 2000s, and the entire section opened on June 30, 2006. During tunnel construction, preserving the ecosystem of Suraksan Mountain and ensuring rock stability were major challenges, and a combination of blasting methods and the New Austrian Tunnelling Method (NATM) was used.
Structure and Design
The Suraksan Tunnel has four round-trip lanes (two lanes per direction), with a design speed of 100 km/h. The interior is equipped with a modern lighting system and ventilation facilities, along with evacuation passages and fire extinguishing equipment for emergencies. The maximum depth of the tunnel is approximately 100 meters below the surface, and the area above includes Suraksan hiking trails and a natural recreation forest, requiring special attention to prevent ground subsidence. Additional soundproof tunnels and noise barriers have been installed on both sides of the tunnel to minimize noise damage to nearby residential areas.
Traffic and Function
As part of the First Ring Expressway of the Seoul Metropolitan Area, the Suraksan Tunnel connects Sanggye-dong, Nowon-gu, Seoul, and Howon-dong, Uijeongbu-si. This tunnel is particularly known as a chronic congestion point during rush hours due to vehicles entering Seoul and those heading toward Uijeongbu. Using the tunnel reduces travel time by approximately 20 to 30 minutes compared to using existing national roads (Dongil-ro, National Route 3), contributing to improved logistics and commuting efficiency in the northeastern Seoul metropolitan area. Traffic monitoring systems and speed enforcement cameras are installed inside the tunnel to promote safe driving.
Safety and Maintenance
The Suraksan Tunnel is managed by the Korea Expressway Corporation, with regular safety inspections and maintenance work. Emergency telephones, fire extinguishers, and evacuation route signs are installed to prepare for fires and accidents inside the tunnel, and detailed safety inspections are conducted twice a year. In 2020, a large-scale improvement project was carried out, replacing aging lighting with LEDs and upgrading the ventilation system. Additionally, a smart system that measures fine dust concentrations inside the tunnel in real time and automatically controls ventilation fans has been introduced.
Latest Trends
As of 2024, large-scale repair plans are being established for the Suraksan Tunnel due to the aging of the First Ring Expressway of the Seoul Metropolitan Area. The Korea Expressway Corporation plans to complete seismic reinforcement and waterproofing work inside the tunnel by 2025, with partial lane closures expected. Additionally, the introduction of a smart tunnel system is accelerating, with AI-based traffic flow prediction and real-time accident detection systems being piloted. In the second half of 2024, the installation of special fire extinguishing equipment for electric vehicle fires inside the tunnel was promoted, marking the first such case in a domestic expressway tunnel. Traffic volume has been increasing again since the COVID-19 pandemic, with an average daily traffic volume of approximately 120,000 vehicles in 2023. Accordingly, discussions on tunnel expansion or alternative routes (e.g., Suraksan Second Tunnel) are ongoing between local governments and the Ministry of Land, Infrastructure and Transport, but specific plans have not yet been finalized.
Related Topics
- [[First Ring Expressway of the Seoul Metropolitan Area]]
- [[Suraksan Mountain]]
- [[Uijeongbu-si]]
- [[Nowon-gu]]
- [[Expressway Tunnel]]
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