As of March 31, 2022, the maintenance rate of national highways amounted to 71.7 percent. Excluding national expressways, they were, therefore, the best-maintained type of roads in Japan. The maintenance rate takes into account the structural quality of roads as well as their congestion.
Maintenance rate of roads in Japan as of March 2022, by road type
The maintenance rate is calculated by dividing the maintained road length by the real road length. Moreover, the maintained road length is calculated by subtracting the length of road sections with a congestion degree of one or higher from standard-improved roads (only including roads with a roadway width of 5.5 meters and more). In case of municipal roads, the maintained road length is equivalent to the length of standard-improved roads of 5.5 meters width and more.
Standard-improved roads are those complying with structural requirements defined by Japanese regulations. The degree of congestion is determined by dividing the yearly measured traffic volume by the traffic capacity as estimated in the 'Road Census' every five years.
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MLIT (Japan). (March 22, 2024). Maintenance rate of roads in Japan as of March 2022, by road type [Graph]. In Statista. Retrieved December 22, 2024, from https://www.statista.com/statistics/1230530/japan-road-maintenance-rate-by-type/
MLIT (Japan). "Maintenance rate of roads in Japan as of March 2022, by road type." Chart. March 22, 2024. Statista. Accessed December 22, 2024. https://www.statista.com/statistics/1230530/japan-road-maintenance-rate-by-type/
MLIT (Japan). (2024). Maintenance rate of roads in Japan as of March 2022, by road type. Statista. Statista Inc.. Accessed: December 22, 2024. https://www.statista.com/statistics/1230530/japan-road-maintenance-rate-by-type/
MLIT (Japan). "Maintenance Rate of Roads in Japan as of March 2022, by Road Type." Statista, Statista Inc., 22 Mar 2024, https://www.statista.com/statistics/1230530/japan-road-maintenance-rate-by-type/
MLIT (Japan), Maintenance rate of roads in Japan as of March 2022, by road type Statista, https://www.statista.com/statistics/1230530/japan-road-maintenance-rate-by-type/ (last visited December 22, 2024)
Maintenance rate of roads in Japan as of March 2022, by road type [Graph], MLIT (Japan), March 22, 2024. [Online]. Available: https://www.statista.com/statistics/1230530/japan-road-maintenance-rate-by-type/
