As of March 31, 2023, tunnels with a standard lining added up to approximately **** thousand kilometers in length. The term tunnel refers only to structures that have been built for passing through natural obstacles like mountainsides, plateaus, the underground, river bottoms, et cetera. Consequently, the statistic does not include underground crosswalks, box culverts, rock or snow sheds, and similar.
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MLIT (Japan). (March 31, 2025). Length of road tunnels in Japan as of March 2023, by interior (in kilometers) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 25, 2026, from /statistics/1229125/japan-tunnel-length-by-interior/
MLIT (Japan). "Length of road tunnels in Japan as of March 2023, by interior (in kilometers)." Chart. March 31, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 25, 2026. /statistics/1229125/japan-tunnel-length-by-interior/
MLIT (Japan). (2025). Length of road tunnels in Japan as of March 2023, by interior (in kilometers). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 25, 2026. /statistics/1229125/japan-tunnel-length-by-interior/
MLIT (Japan). "Length of Road Tunnels in Japan as of March 2023, by Interior (in Kilometers)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 31 Mar 2025, /statistics/1229125/japan-tunnel-length-by-interior/
MLIT (Japan), Length of road tunnels in Japan as of March 2023, by interior (in kilometers) ÌÇÐÄÆƽâ°æ, /statistics/1229125/japan-tunnel-length-by-interior/ (last visited July 25, 2026)
Length of road tunnels in Japan as of March 2023, by interior (in kilometers) [Graph], MLIT (Japan), March 31, 2025. [Online]. Available: /statistics/1229125/japan-tunnel-length-by-interior/
