The Japanese road network has a hierarchical structure that classifies from bottom to top municipal roads, prefectural roads, national highways, and national expressways. Their classification is based on their function and implicates their jurisdiction, administrator, and financing.
Major regional roads and general prefectural roads are subcategories of prefectural roads.
As of March 31, 2023, municipal roads in Japan added up to a network of around **** million kilometers. Municipal roads are on the lower end of the pyramidical hierarchy of roads in Japan, accounting for many more kilometers in the national road network than any other road type.
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MLIT (Japan). (March 31, 2025). Length of roads in Japan as of March 2023, by road type (in 1,000 kilometers) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 20, 2026, from /statistics/1230597/japan-real-road-length-by-type/
MLIT (Japan). "Length of roads in Japan as of March 2023, by road type (in 1,000 kilometers)." Chart. March 31, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 20, 2026. /statistics/1230597/japan-real-road-length-by-type/
MLIT (Japan). (2025). Length of roads in Japan as of March 2023, by road type (in 1,000 kilometers). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 20, 2026. /statistics/1230597/japan-real-road-length-by-type/
MLIT (Japan). "Length of Roads in Japan as of March 2023, by Road Type (in 1,000 Kilometers)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 31 Mar 2025, /statistics/1230597/japan-real-road-length-by-type/
MLIT (Japan), Length of roads in Japan as of March 2023, by road type (in 1,000 kilometers) ÌÇÐÄÆƽâ°æ, /statistics/1230597/japan-real-road-length-by-type/ (last visited July 20, 2026)
Length of roads in Japan as of March 2023, by road type (in 1,000 kilometers) [Graph], MLIT (Japan), March 31, 2025. [Online]. Available: /statistics/1230597/japan-real-road-length-by-type/
