The inspection items of tunnels include road surface breakage and cleaning condition, lane paint condition, lining crack, leakage, corrosion condition, tile cleaning condition, daylight and nighttime optimum illuminance condition, drainage facility damage and cleaning condition, Gangway wall wall and retaining wall abnormality, slope top and side slope condition. However, investigations for maintenance of tunnels mainly consisted of surveying condition and durability of concrete lining due to characteristics of tunnels.

• 김낙영(한국도로공사 도로교통연구원 안전연구실) | Kim Nag-Young
• 도종남(한국도로공사 도로교통연구원 안전연구실) | Do Jong-Nam
• 이강현(한국도로공사 도로교통연구원 안전연구실) | Lee Kang-Hyun
• 이지영(한국도로공사 도로교통연구원 안전연구실) | Lee Ji-Young