As of March 31, 2023, most Japanese standard-improved roads had a roadway width of *** meters or less, accounting for **** percent of the regular road network length. Ensuring the quality and security of Japan's roads, the standard is a set of regulations, which were introduced successively since the 1960s in light of growing traffic.
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MLIT (Japan). (March 31, 2025). Distribution of standard-improved roads in Japan based on length as of March 2023, by width [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 14, 2026, from /statistics/1229188/japan-improved-road-share-based-on-length-by-width/
MLIT (Japan). "Distribution of standard-improved roads in Japan based on length as of March 2023, by width." Chart. March 31, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 14, 2026. /statistics/1229188/japan-improved-road-share-based-on-length-by-width/
MLIT (Japan). (2025). Distribution of standard-improved roads in Japan based on length as of March 2023, by width. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 14, 2026. /statistics/1229188/japan-improved-road-share-based-on-length-by-width/
MLIT (Japan). "Distribution of Standard-improved Roads in Japan Based on Length as of March 2023, by Width." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 31 Mar 2025, /statistics/1229188/japan-improved-road-share-based-on-length-by-width/
MLIT (Japan), Distribution of standard-improved roads in Japan based on length as of March 2023, by width ÌÇÐÄÆƽâ°æ, /statistics/1229188/japan-improved-road-share-based-on-length-by-width/ (last visited July 14, 2026)
Distribution of standard-improved roads in Japan based on length as of March 2023, by width [Graph], MLIT (Japan), March 31, 2025. [Online]. Available: /statistics/1229188/japan-improved-road-share-based-on-length-by-width/
