fiscal years 2014 to 2021; the Japanese fiscal years run from April 1 of the stated year to March 31 of the followig year
Special properties
not including facilities under inspection as of March 31, 2022; 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.
Citation formats
Distribution of road tunnel soundness in Japan 2022, by building age
As of March 31, 2022, around one percent of road tunnels at least 51 years of building age in Japan were in a critical condition that required immediate action to restore the structural integrity. Tunnels of this group accounted for *** percent of roughly thousand inspected tunnels.
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MLIT (Japan). (September 16, 2022). Distribution of inspection results of road tunnel conditions in Japan as of March 2022, by building age [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 28, 2026, from /statistics/1231342/japan-share-road-tunnel-conditions-by-age/
MLIT (Japan). "Distribution of inspection results of road tunnel conditions in Japan as of March 2022, by building age." Chart. September 16, 2022. ÌÇÐÄÆƽâ°æ. Accessed July 28, 2026. /statistics/1231342/japan-share-road-tunnel-conditions-by-age/
MLIT (Japan). (2022). Distribution of inspection results of road tunnel conditions in Japan as of March 2022, by building age. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 28, 2026. /statistics/1231342/japan-share-road-tunnel-conditions-by-age/
MLIT (Japan). "Distribution of Inspection Results of Road Tunnel Conditions in Japan as of March 2022, by Building Age." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 16 Sep 2022, /statistics/1231342/japan-share-road-tunnel-conditions-by-age/
MLIT (Japan), Distribution of inspection results of road tunnel conditions in Japan as of March 2022, by building age ÌÇÐÄÆƽâ°æ, /statistics/1231342/japan-share-road-tunnel-conditions-by-age/ (last visited July 28, 2026)
Distribution of inspection results of road tunnel conditions in Japan as of March 2022, by building age [Graph], MLIT (Japan), September 16, 2022. [Online]. Available: /statistics/1231342/japan-share-road-tunnel-conditions-by-age/
