As of March 31, 2023, around 0.3 percent of road tunnels in Japan were in a critical condition that required immediate action to restore the structural integrity. In the course of eight years, approximately 11.11 thousand tunnels received a close visual inspection.
Distribution of inspection results of road tunnel conditions in Japan as of March 2023
not including facilities under inspection as of March 31, 2023; classification after close visual inspection into stages*
Supplementary notes
*Stage I: Good. No structural deficiency. Stage II: Preventive maintenance. Preventive maintenance is desirable, although no structural deficiency is found. Stage III: Early rehabilitation. The structure needs early rehabilitation, or it can become deficient. Stage IV: Emergency rehabilitation. The structure needs emergency rehabilitation because it is deficient or it will most likely become deficient.
Percentages may not total 100 due to rounding by the source.
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MLIT (Japan). (August 23, 2023). Distribution of inspection results of road tunnel conditions in Japan as of March 2023 [Graph]. In Statista. Retrieved October 30, 2024, from https://www.statista.com/statistics/1231348/japan-share-road-tunnel-conditions/
MLIT (Japan). "Distribution of inspection results of road tunnel conditions in Japan as of March 2023." Chart. August 23, 2023. Statista. Accessed October 30, 2024. https://www.statista.com/statistics/1231348/japan-share-road-tunnel-conditions/
MLIT (Japan). (2023). Distribution of inspection results of road tunnel conditions in Japan as of March 2023. Statista. Statista Inc.. Accessed: October 30, 2024. https://www.statista.com/statistics/1231348/japan-share-road-tunnel-conditions/
MLIT (Japan). "Distribution of Inspection Results of Road Tunnel Conditions in Japan as of March 2023." Statista, Statista Inc., 23 Aug 2023, https://www.statista.com/statistics/1231348/japan-share-road-tunnel-conditions/
MLIT (Japan), Distribution of inspection results of road tunnel conditions in Japan as of March 2023 Statista, https://www.statista.com/statistics/1231348/japan-share-road-tunnel-conditions/ (last visited October 30, 2024)
Distribution of inspection results of road tunnel conditions in Japan as of March 2023 [Graph], MLIT (Japan), August 23, 2023. [Online]. Available: https://www.statista.com/statistics/1231348/japan-share-road-tunnel-conditions/
