As of March 31, 2023, Hokkaido was the Japanese Prefecture with the highest accumulated length of tunnels, amounting to approximately * kilometers. Overall, road tunnels in Japan added up to over five thousand kilometers.
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MLIT (Japan). (March 31, 2025). Length of road tunnels in Japan as of March 2023, by prefecture (in kilometers) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 24, 2026, from /statistics/1229150/japan-tunnel-length-by-prefecture/
MLIT (Japan). "Length of road tunnels in Japan as of March 2023, by prefecture (in kilometers)." Chart. March 31, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 24, 2026. /statistics/1229150/japan-tunnel-length-by-prefecture/
MLIT (Japan). (2025). Length of road tunnels in Japan as of March 2023, by prefecture (in kilometers). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 24, 2026. /statistics/1229150/japan-tunnel-length-by-prefecture/
MLIT (Japan). "Length of Road Tunnels in Japan as of March 2023, by Prefecture (in Kilometers)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 31 Mar 2025, /statistics/1229150/japan-tunnel-length-by-prefecture/
MLIT (Japan), Length of road tunnels in Japan as of March 2023, by prefecture (in kilometers) ÌÇÐÄÆƽâ°æ, /statistics/1229150/japan-tunnel-length-by-prefecture/ (last visited July 24, 2026)
Length of road tunnels in Japan as of March 2023, by prefecture (in kilometers) [Graph], MLIT (Japan), March 31, 2025. [Online]. Available: /statistics/1229150/japan-tunnel-length-by-prefecture/
