According to the source, 'standard-improved' means that the quality of roads, such as width, alignment, inclination, and visibility, is improved to meet the standard stipulated by the Ordinance on Road Structure. Figures are 'real lengths'. According to the source, real length of roads refers to the length of roads minus duplicate length (duplicate sections), length not in service (sections for which no notification of commencement of service has been provided) and water length (sections on the sea, rivers, lakes or marshes where ferrying services are available). Due to the Great East Japan Earthquake, figures for 2011 and 2012 partly include data for city, town and village roads as of April 1, 2012 and before.
Data prior to 2022 come from previous reports. Values have been rounded.
Citation formats
Length of standard-improved roads in Japan 2014-2023
As of March 31, 2023, the length of standard-improved roads amounted to approximately *** thousand kilometers, representing an increase from around *** thousand kilometers in 2014. The standard refers to qualitative criteria (width, alignment, inclination, visibility, etc.) as stipulated by the Ordinance on Road Structure designated roads are required to meet.
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MLIT (Japan). (March 31, 2025). Length of standard-improved roads in Japan from 2014 to 2023 (in 1,000 kilometers) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 24, 2026, from /statistics/862609/japan-standard-improved-road-length/
MLIT (Japan). "Length of standard-improved roads in Japan from 2014 to 2023 (in 1,000 kilometers)." Chart. March 31, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 24, 2026. /statistics/862609/japan-standard-improved-road-length/
MLIT (Japan). (2025). Length of standard-improved roads in Japan from 2014 to 2023 (in 1,000 kilometers). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 24, 2026. /statistics/862609/japan-standard-improved-road-length/
MLIT (Japan). "Length of Standard-improved Roads in Japan from 2014 to 2023 (in 1,000 Kilometers)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 31 Mar 2025, /statistics/862609/japan-standard-improved-road-length/
MLIT (Japan), Length of standard-improved roads in Japan from 2014 to 2023 (in 1,000 kilometers) ÌÇÐÄÆƽâ°æ, /statistics/862609/japan-standard-improved-road-length/ (last visited July 24, 2026)
Length of standard-improved roads in Japan from 2014 to 2023 (in 1,000 kilometers) [Graph], MLIT (Japan), March 31, 2025. [Online]. Available: /statistics/862609/japan-standard-improved-road-length/
