As of ****, around ** percent of inspected road tunnels in Japan were built ** and more years ago, constituting the building age with the largest share. Overall, the number of inspected tunnels in Japan amounted to approximately thousand.
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MLIT (Japan). (September 16, 2022). Distribution of inspected road tunnels in Japan as of March 2022, by building age [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 21, 2026, from /statistics/1231327/japan-inspected-road-tunnels-share-by-age/
MLIT (Japan). "Distribution of inspected road tunnels in Japan as of March 2022, by building age." Chart. September 16, 2022. ÌÇÐÄÆƽâ°æ. Accessed July 21, 2026. /statistics/1231327/japan-inspected-road-tunnels-share-by-age/
MLIT (Japan). (2022). Distribution of inspected road tunnels in Japan as of March 2022, by building age. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 21, 2026. /statistics/1231327/japan-inspected-road-tunnels-share-by-age/
MLIT (Japan). "Distribution of Inspected Road Tunnels in Japan as of March 2022, by Building Age." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 16 Sep 2022, /statistics/1231327/japan-inspected-road-tunnels-share-by-age/
MLIT (Japan), Distribution of inspected road tunnels in Japan as of March 2022, by building age ÌÇÐÄÆƽâ°æ, /statistics/1231327/japan-inspected-road-tunnels-share-by-age/ (last visited July 21, 2026)
Distribution of inspected road tunnels in Japan as of March 2022, by building age [Graph], MLIT (Japan), September 16, 2022. [Online]. Available: /statistics/1231327/japan-inspected-road-tunnels-share-by-age/
