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 Statista. Retrieved June 22, 2025, from https://www.statista.com/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. Statista. Accessed June 22, 2025. https://www.statista.com/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. Statista. Statista Inc.. Accessed: June 22, 2025. https://www.statista.com/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." Statista, Statista Inc., 31 Mar 2025, https://www.statista.com/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 Statista, https://www.statista.com/statistics/1229188/japan-improved-road-share-based-on-length-by-width/ (last visited June 22, 2025)
Distribution of standard-improved roads in Japan based on length as of March 2023, by width [Graph], MLIT (Japan), March 31, 2025. [Online]. Available: https://www.statista.com/statistics/1229188/japan-improved-road-share-based-on-length-by-width/
